The utility model discloses an armoring movable -type switch cabinet valve blocking device, the movable plate, baffle and limiting plate from the top down level are in proper order placed, the processus aboralis part of movable plate right -hand member goes up to open there is fore -and -aft long slot bore I, the limiting plate is fixed on the cabinet body, it has horizontal long slot bore II to open on the limiting plate intermediate position, it has the round hole to open on the baffle intermediate position, I from the top down on the bolt passes long slot bore I in proper order, long slot bore II and round hole, II from the top down on the bolt pass the right front end of movable plate and the right front end of limiting plate in proper order, make movable plate and limiting plate articulated mutually, the left back end at the limiting plate is fixed to the rear end of spring, the rear end in movable plate processus aboralis part is fixed to its front end. The utility model has the characteristics of nimble convenience, safe and reliable, easily installation.