The invention discloses a combined type water-pumping energy-storage power generation device by utilizing wave energy. The device is composed of a single machine power generation device and a set power generation device. The single machine power generation device is composed of a water spraying pipe, a piston rod, a floating body, a piston, a one-way valve and a generator unit; the floating body is driven to move through wave fluctuation motion, seawater drives the generator unit to do work through the water spraying pipe, and is sprayed into a water storage tank of a central stand column; andafter the water level in the water tank meets the requirement, the water is discharged, and a water turbine in the central stand column is driven to generate electricity. According to the combined type water-pumping energy-storage power generation device by utilizing the wave energy, the water storage tank serves as a buffer link, the time-varying and irregular wave energy can be converted into stable potential energy, two-stage utilization of energy can be realized, and the power generation efficiency of the whole machine is improved.