Plug-in type metal shell button

The plug-in type metal shell button comprises an upper shell and a lower shell, the bottom ends of the two sides of the upper shell and the top ends of the two sides of the lower shell are connected through connecting assemblies, and the two ends of the upper shell and the two ends of the lower shell are each provided with an end plate; a first round hole is formed in the middle of the top end of the upper shell, a fastening plastic nut is arranged at the bottom end of the first round hole and located between the upper shell and the lower shell, a button body is arranged at the bottom end of the fastening plastic nut, a clamping hole is formed in the top of the button body, and a button is arranged at the top end of the upper shell. The bottom end of the button sequentially penetrates through the first round hole and the fastening plastic nut and extends into the clamping hole. A second round hole is formed in the side wall of one end plate, and a flange connector is arranged in the second round hole. The ben