The invention discloses a variable pressure-changing pipe network pressure-superposed flow stabilization water supply device. The variable pressure-changing pipe network pressure-superposed flow stabilization water supply device is mainly composed of a flow stabilization compensation tank, a negative pressure eliminator, a water pump, a flow sensor and a control cabinet; a water outlet of the flow stabilization compensation tank is connected with a water supply pipe through the water pump so as to be connected to a water using point for water supply, and a pressure detecting meter and a flow sensor are arranged on the water supply pipe; and the control cabinet is used for monitoring the water inlet pressure of the flow stabilization compensation tank and the outlet water flow of the water supply pipe, and detecting and controlling change of the outlet water pressure of the water supply pipe with the outlet water flow so that self-adaptive regulation of the pressure control value is performed, and frequency conversion, variable and pressure changing water supply characterized in that different flows correspond to different pressures, and the change is infinitely close to an actual pipe characteristic curve of a water using system is achieved. The variable pressure-changing pipe network pressure-superposed flow stabilization water supply device has the beneficial effects that variable pressure-changing non-negative-pressure pipe network pressure-superposed flow stabilization water supply can be achieved, and the pressure of a tap water inlet pipe can be sufficiently utilized for saving energy; in addition, the lift waste for flow reduction is overcome, and further energy saving is facilitated; and meanwhile the advantages of being less in occupied land, saving the investment, being convenient and easy to install and maintain and wide in application range, and the like are achieved.