The utility model relates to an elastic self-resetting positioning device for a telescopic worktable, which comprises a pin column (1), a screw sleeve (2), a sleeve (3), a reset spring (4) and a pulling button (5). The reset spring (4) is connected with the screw sleeve (2). The sleeve (3) is sleeved outside the screw sleeve (2) and the reset spring (4). The screw sleeve (2) is connected with one end of the sleeve (3). The pulling button (5) is arranged at the other end of the sleeve (3). The screw sleeve (2) is arranged on a sliding surface (7) of a sliding guide rail pair of the telescopic worktable. The pin column (1) passes through the screw sleeve (2), the reset spring (4) and the sleeve (3) to be connected with the pulling button (5). The utility model provides the elastic self-resetting positioning device for the telescopic worktable fixes the position of the worktable relative to a cabinet by additionally arranging a positioning device between a fixed guide rail surface and the sliding guide rail surface of the guide rail pair.