Double-chamber hydraulic cylinder

The invention discloses a double-chamber hydraulic cylinder. The double-chamber hydraulic cylinder comprises a cylinder body and a piston, the cylinder body comprises a front end face and a rear end face. A cavity and a guide hole are formed in the cylinder body, and a limiting end wall is formed on the inner surface of the cylinder body; the piston comprises a piston disc and a piston rod, the piston disc divides the cavity into a first cavity and a second cavity, a communicating cavity is formed between the peripheral face of the piston rod and the inner wall of the guide hole, a through hole is formed in the piston rod, a first opening is formed in one end of the through hole, and a second opening is formed in the other end of the through hole. The first opening and the second opening are staggered in the axial direction of the piston rod, so that when the piston disc is located at the position attached to the limiting end wall, the communicating cavity communicates with the first cavity through the commun