The invention discloses an inertial pump with triple piezoelectric stacked diamond-shaped amplifying structure, which consists of a flow tube, a wheel-type check valve, an umbrella-type check valve, a cantilever beam, a cantilever beam screw, a cantilever beam quality block, a pump body, and a diamond-shaped amplifying pump. Structure, small stack cover, small stack cover screw, large stack cover, large stack cover screw, small piezoelectric stack, and large piezoelectric stack. The included angle between the upper and lower arms of the diamond-shaped amplifying structure is 60°, so that the diamond-shaped amplifying mechanism has the best effect of transmitting and amplifying the movement and displacement of the small piezoelectric stack and the large piezoelectric stack. There are three stacks in the driving part. Two small piezoelectric stacks and one large piezoelectric stack are connected to two sets of independent power supplies with opposite phases, so that the small piezoelectric stack and the large piezoelectric stack move in opposite directions. The flow pipe is provided with a one-way valve mounting seat, and a wheel-type one-way valve or an umbrella-type one-way valve can be selected to be placed on the one-way valve mounting seat to reversely stop the liquid return flow.