The invention provides a low-voltage switch cabinet 1/2 drawer unit (9) capable of effectively preventing mis-operation. The 1/2 drawer unit (9) is arranged on a holding plate (5) of a low-voltage switch cabinet. The holding plate, a drawer main plate (6) and a drawer panel (7) form a framework. A switch handle (8) is installed on the drawer panel. An operation through hole is arranged in the drawer panel. An operation module (1), a pushing module (2), an isolation limiting module (3) and a switch linkage module (4) are installed in the 1/2 drawer unit (9). The operation module is fixed on the back of the drawer panel. The pushing module is arranged on the drawer main plate and one end of the pushing module is connected with the operation module. The isolation limiting module is arranged under the operation module. The switch linkage module is arranged behind the drawer panel and in the position opposite to the operation module. According to the invention, a three-position switching function and orderly operation of all states of the 1/2 drawer unit can be achieved; and a locking function is arranged in the isolation position, so it is ensured that when a switch is in a closing state, switching in different positions cannot be performed and load separation is avoided.