The invention discloses a soft interlocking mechanism used in a switchgear entering and leaving device, and aims at solving the problem in the existing movable entering and leaving operation. The device comprises a protective clutch assembly (20), a screw (7), and a nut assembly (21). One end of the screw (7) is connected with the protective clutch assembly (20) and the other end of the screw (7) is movably connected with the nut assembly (21). When in over-torque operation, the protective clutch assembly is started to cause an operating head to skid, which leads to an invalid operation and realizes protection of the mechanism and the device; when a breaker is switched on or an earthing switch is switched on, the nut only rotates along with the screw and the nut assembly does not move, which causes the entering and leaving operation to be invalid and realizes the interlocking requirement. The mechanism has the advantages of simple and compact structure, small volume, high reliability and strong anti-misoperation ability. The misoperation of an operator causes no damage to and no impact on the whole switchgear, and can effectively eliminate operating accidents.