The invention relates to a braker for an elevator tractor, which comprises an electromagnet core seat inlaid with electromagnetic coils, an armature connected to the electromagnet core seat through a manual declutching device, a liner plate arranged on the armature, a brake sheet arranged on the liner plate, a braking spring arranged in a spring hole of the electromagnet core seat and a buffer device arranged between the electromagnet core seat and the armature. The braker for an elevator tractor is characterized in that the liner plate is formed by processing a soft steel plate with better magnetic conductivity and is fixed on the armature through a pin; and a cable is led out from the top of the electromagnet core seat. Compared with the prior art, the braker for an elevator tractor hasthe advantages of small volume, low noise, adjustable brake torque, small size of the armature, labor conservation for manual declutching and automatic replacement after declutching; in addition, glue is difficult to leak in the process of production and the cable is difficult to crush.