Surface throttling and slit throttling combined type friction-free balance cylinder and working method

The invention discloses a surface throttling and slit throttling combined type friction-free balance cylinder and a working method, the surface throttling and slit throttling combined type friction-free balance cylinder comprises a front end cover, a piston rod, a cylinder body, pistons and a rear end cover, the pistons comprise an inner piston and an outer piston, the inner piston is nested in the outer piston, the other end of the piston rod is fixed on the inner piston, and the outer piston is in sliding contact with the inner surface of the cylinder body; the end face, adjacent to the rear end cover, of the inner piston is provided with an air supply channel in the axial direction, the inner side face of the outer piston is provided with an inner annular groove matched with the air supply hole, the outer side face of the outer piston is provided with an arc-shaped slit hole channel, the arc-shaped slit hole channel is formed in the bottom of the inner annular groove and communicated with the inner annular