The present invention relates to a locker dial lock, and more specifically has been made to enhance convenience of use by rotating a knob for operating a locking lever of a dial lock to a reset position not to a locking or opening position, and then identifying or resetting a combination of dials so as to simply change and reset the combination. The configuration of the present invention is a dial lock 1 configured such that a main body 3 including a key cylinder bundle 10 and a dial bundle 20 is installed at a front surface of a door of a locker, and when a plurality of dials 24 exposed to the outside of a cover 2 at a front surface of the main body 3 are rotated to match a set combination, the key cylinder bundle 1 is released and a door is opened by rotating a locking lever 4 at a back surface of the door along with a knob 11, and when the combination is forgotten, the knob 11 is rotated using a master key to press an operating rod 21 of the dial bundle 20, thereby allowing detection holes 23 provided on one side of connecting rod bodies 22 respectively fitted into and coupled to the plurality of dials 24 to be exposed, and the detection pins 55 of a detection means 30 that are provided on one side of the connecting rod bodies 22 are inserted into the detection holes 23 to determine a combination of the dials 24, wherein the detection means 30 includes: a manipulation member 40 having a push protrusion 41 at an upper portion thereof, including a return spring 42 at a lower portion thereof, and provided with a plurality of manipulation uneven portions 43 on one side thereof, wherein the push protrusion 41 is pressed by a pressing cam part 13 further included in the key cylinder bundle 10, thus allowing the manipulation member 40 to be slidably moved upward or downward; and a detection member 50 positioned on one side of the manipulation member 40 and rotatably assembled to the main body 3 about a hinge pin 51, provided with detection uneven portions 53 on one side thereof to correspond to the plurality of manipulation uneven portions 43 about the hinge pin 51, and including the detection pins 55 provided on another side thereof and inserted into the detection holes 23 of the connecting rod bodies 22, wherein, when the combination is forgotten, the knob 11 is rotated to a setting position using a master key to allow the key cylinder bundle 10 to press the operating rod 21 of the dial bundle 20, thereby exposing the detection holes 23 provided in one side of the connecting rod bodies 22 respectively fitted into and coupled to the plurality of dials 24, and while the pressing cam part 13 of the key cylinder bundle 10 presses the push protrusion 41 of the manipulation member 40 to enable the manipulation member 40 to be moved downward, convex portions of the manipulation uneven portions 43 engaged with and coupled to the detection uneven portions 53 move while pushing convex portions of the detection uneven portions 53, thus enabling the detection means 30 to be rotated about the hinge pin 51 and the detection pins 55 to be inserted into the detection holes 23 of the connecting rod bodies 22, thereby detecting the combination of the dials 24.