The invention discloses a numerical control milling machine with a controllable stroke. The numerical control milling machine comprises a milling cutter, a cutter holder for accommodating the milling cutter, a machining platform for accommodating a workpiece and a control system, and is characterized in that a limiting switch module is arranged on the rim of the machining platform; a baffle block or a baffle plate corresponding to the limiting switch module is arranged in a peripheral space of the machining platform; a set stroke distance is reserved between the baffle block or the baffle plate; the limiting switch module is connected with the control system through a line; and sealing devices are arranged at a line inlet and a line outlet of a box body of the limiting switch module. When the machining platform moves to an extreme position, the switch module touches the baffle block or the baffle plate and transmits a signal to the control system; and the control system controls the machining platform to stop or to move reversely, so that a machine tool can run safely.