The invention discloses a shoe power generation device provided with closed liquid bags, which comprises a rotor and a stator, wherein, the rotor is arranged in a cavity, and is provided with a rotary core which can drive the rotor to rotate, the rotary core is provided with a driven transmission part; the cavity is provided with at least two hollow pipes one ends of which are connected with liquid bags, the inside of at least one of the hollow pipes is provided with a piston, the piston is connected with a driving transmission part corresponding to the driven transmission part; the hollow pipes, the liquid bags and the cavity form a closed cavity, working liquid medium is stored in the closed cavity, and the piston divides the working liquid medium into mutually independent spaces. The invention takes advantage of the hydraulic transmission principle, abandons the gear speed-increasing transmission mechanism which is widely used in the prior power generation device and has larger volume, but takes advantage of the presssurized flow of the working liquid medium to push the piston to drive the rotor of the generator to rotate, thereby achieving the power generation and greatly reducing the volume of the power generation device. The power generation device has the characteristics of simple structure, small volume, low cost, stability and high efficiency.