Sleeve type supporting rod with snap ring internal lock

The invention discloses a sleeve type supporting rod with a snap ring internal lock. The supporting rod comprises a piston supporting rod body, a clamping ring, an outer cylinder and an unlocking actuating cylinder, the piston supporting rod body is arranged in the outer cylinder, a rod body, close to the large end, of the piston supporting rod body is sleeved with a piston in sliding fit with the inner wall of the outer cylinder, the small end of the piston supporting rod body is in clearance fit with a via hole in the small end of the outer cylinder, and the unlocking actuating cylinder is arranged at the large end of the outer cylinder; the unlocking actuating cylinder comprises a joint, an unlocking piston rod and an end cover; and the output end of the unlocking piston rod penetrates through the end cover to be provided with a check block, the check block is fixedly connected with the piston through a threaded connecting rod to be limited in the piston supporting rod, a retainer is arranged on a rod body