The invention relates to a wave generating system which comprises a wave energy colleting module, a motion and transformation module and a generator and a wave adaptation module which is dynamically connected to the motion and transformation module through the wave energy colleting module. The motion and transformation module is then dynamically connected to the generator. The wave adaptation module includes a hydraulic pressure expansion link. The hydraulic pressure expansion link includes a vertically arranged hydraulic cylinder. A blocking ring is arranged in a cylinder barrel of the hydraulic cylinder. A piston rod and an upper piston connected to the motion and transformation module are arranged in the cylinder barrel above the blocking ring; and a piston rod and a lower piston connected to the wave energy colleting module are arranged in the cylinder barrel below the blocking ring. A lower hydraulic cylinder between the upper piston and the lower piston is provided with a liquid outlet and a liquid inlet which are respectively connected to liquid storage tanks of an outside hydraulic system through one-way valves. The wave generating system using the inventive technical scheme can adapt to the change in tidal wave and eliminate the influence of the tide to the wave generating system.