The invention relates to a working method for a buffer suitable for a sliding block in an attraction impact process. The buffer comprises a cylinder body and a cylinder cover used for closing the opening of the cylinder body, wherein a center though hole is formed in the central axis of the cylinder cover; a piston rod penetrates through the center through hole; a piston body component is arranged at the top end of the piston rod; the tail end of the piston rod is connected with the end part of the left side of an outer barrel; during buffering work, the right end face of the cylinder body is used as a contact surface in collision with the sliding block; an electromagnetic coil is wound in the side wall of the cylinder body; a pressure sensor used for detecting medium pressure is arranged on the right end face of the piston body component, and is connected with a processing module; when the sliding block collides the right end face of the cylinder body, the processing module is suitable for controlling a current driving module to output currents matched with a medium pressure value according to the medium pressure value, so as to enable the electromagnetic coil to generate a corresponding magnetic field to attract the sliding block; and when the processing module measures that the medium pressure value is an equilibrium value, the current driving module is controlled to stopping outputting the currents so as to release the sliding block.