A lever gravity self-pressurization type power generation device, comprising an power generator set (9), and further comprising a water storage tank (1). A small water storage tank (105) is provided in the water storage tank (1); an automatic weight-increasing water discharge bucket (3) is provided below the water storage tank (1); a water discharge hose II (304) of the automatic weight-increasing water discharge bucket (3) is communicated with a water receiving tank I (2); a pressure rod (305) is further mounted at the bottom of a bucket body (301); and a raising rod assembly (6) is correspondingly mounted below the pressure rod (305). A principle of a lever combined with gravity is adopted for the lever gravity self-pressurization type power generation device, and by means of the design of a lever assembly and the automatic weight-increasing water discharge bucket, a force is applied to one end of a raising rod by the gravity and inertia of a water flow, the automatic weight-increasing water discharge bucket, etc., such that a semi-elliptical gear at the other end of the raising rod easily drives a meshing gear to rotate, thereby achieving the purposes of energy storage and power generation, solving the problems that existing new energy is affected by environment and the operation of a new energy device consumes a lot of power, and achieving the purposes of energy saving and environmental protection. The loss of the power consumption of the lever gravity self-pressurization power generation device can be reduced, power transmitted to the outside is large, and the lever gravity self-pressurization power generation device has a simple structure, a small volume, and good reliability.