A sliding plug door shield plate lock with an automatic resilience device belongs to the field of special locks for train sliding plug door shield plates. The sliding plug door shield plate lock comprises a lock body, a lock cylinder, a lock cylinder reset torsion spring, a lock body pressing plate, a spring bolt, a spring bolt fastening screw, a spring bolt anti-loosening sunk screw and a plurality of adjusting gaskets. The lock cylinder and the lock cylinder reset torsion spring are coaxially embedded in the lock body, and the lock cylinder is rotationally connected with the lock body through the lock cylinder reset torsion spring. The rear portion of the lock body is connected with the lock body pressing plate, and the spring bolt is fixedly connected to the center of the rear end of the lock body through the spring bolt fastening screw. The spring bolt anti-loosening sunk screw is in threaded connection with a counter bore in the side wall of the lock cylinder, and the front end ofthe spring bolt anti-loosening sunk screw jacks the outer side wall of the spring bolt fastening screw in the radial direction. The lock body and the spring bolt are located on the front side and therear side of the lock body pressing plate correspondingly. The shield plate lock has the functions of automatic reset locking and locking opening indicating, stability after the shield plate lock isinstalled is improved, the situation that the spring bolt cannot rotate due to jamming can be avoided, and the sunk screw is adopted so that possibility of interference with other components is reduced.