The utility model discloses a self -locking formula connects glass steel protective net, including net rack, the inner wall connection of net rack has the protective net, the left and right sides of net rack all are connected with two buckle bars, the left and right sides of net rack all are equipped with the mounting stand, the left and right sides of each mounting stand all are connected with two buckles, the outer surface of each mounting stand all is with the inner wall of buckle sleeve and is connected, the upper surface of net rack is connected with two self -locking components. The device is through the installation stand, buckle sleeve, buckle bar, net rack and protective net of setting, can use the buckle joint cooperation of buckle bar and buckle sleeve, and the quick installation operation of this protective net is convenient, and through the setting self -locking component, support plate, slide hole, lock pin, lock hole and self -locking spring, can use the telescopic elasticity of self -locking spring and drive lock pin to move, and automatically extend into the inside of lock hole, realize this protective net automatic lock buckle connection, and the stable use of this protective net is convenient.