Four-wire switchable type high-definition entrance machine

The four-line mode-switchable high-definition entrance machine comprises an outer shell and an inner container, the inner container comprises a rear inner shell and a front inner shell, empty cylinders are welded to the two sides of the inner wall of the adjacent side of the rear inner shell, movable blocks are connected into the empty cylinders in a sliding mode, and clamping blocks are welded tothe outer walls of one sides of the movable blocks; a button is welded to the outer wall of the other side, away from the clamping block, of the movable block, the outer wall, located in the empty cylinder, of the clamping block is sleeved with a spring, a button groove is formed in the outer wall, close to the empty cylinder, of the rear inner shell, and the button penetrates through the buttongroove. The front inner shell and the rear inner shell can be clamped and fixed, a plurality of bolts are not needed for fixing, the rear inner shell and the front inner shell are more convenient to mount and dismount, the out