Brake device of elevator

The invention provides a brake device for an elevator which can not only further improve safety, but also can reduce the switching loss generated by turning on and off the unit. The brake device of the elevator comprises a rectification circuit (2) which shifting an alternating current to a direct current; a smoothing capacitor (3) connected to an output end of the rectification circuit; a seriescircuit of a diode (5) and a semi-conductor switch (6) parallelly connected with the smoothing capacitor; a brake winding (10) parallelly connected to the diode; a brake (11) with a brake force changing according to the electromagnetic force of the brake winding; and an calculation processing device (13) which generates a control command for controlling the semi-conductor on and off. The brake device of the elevator further comprises a first electromagnetic contactor (7) arranged between the diode (5) and the brake winding (10); and a second electromagnetic contactor (4) arranged between the smoothing capacitor (3) an