本发明涉及建筑装潢材料技术领域，尤其涉及密锁板组件及其板材安装结构，密锁板相互拼接且通过密锁板卡扣安装在墙面上，伸缩密锁板卡扣通过自攻螺丝固定在墙面上，伸缩件设置在两密锁板之间且通过自攻螺丝固定在墙面上，装饰配件安装在伸缩件上。有益效果为：本申请的密锁板相互拼接，并通过密锁板卡扣安装在墙面上，若需要安装阴角线件、装饰线件和阳角线，则利用伸缩件来进行安装固定在墙面上，密锁板与伸缩件之间保留一定的间隙，当夏天受热膨胀时，密锁板有一定空间可伸展，同一面的密锁板可向同一个方向位移，避免相互挤压损坏。

The invention relates to the technical field of building decoration materials, and particularly relates to a sealing lock plate assembly and a plate installation structure thereof. Sealing lock plates are spliced with one another and installed on a wall through sealing lock plate buckles, the telescopic sealing lock plate buckles are fixed to the wall through self-tapping screws, a telescopic part is arranged between the two sealing lock plates and fixed to the wall through self-tapping screws, and a decoration accessory is installed on the telescopic part. The sealing lock plate assembly and the plate installation structure thereof have the advantages that the sealing lock plates are spliced with one another and installed on the wall through the sealing lock plate buckles, if internal corner line parts, decoration line parts and external corner lines need to be installed, the telescopic part is used for installing and fixing the sealing lock plates to the wall, certain gaps are reserved between the sealing lock plates and the telescopic part, when the sealing lock plates are heated and expand in summer, certain space is reserved for the sealing lock plates to stretch, the sealing lock plates on the same face can move in the same direction, and mutual extrusion damage is avoided.