The utility model relates to an electromagnetic control traction sheave brake. A traction sheave comprises a cylindrical sheave body and a hollow cylindrical shaft sleeve, wherein the hollow cylindrical shaft sleeve and the cylindrical sheave body are of the same shaft. The sheave body is connected with the shaft sleeve through a plurality of spokes, wherein the plurality of spokes are perpendicular to the sheave body and are distributed in a circumferential mode. The electromagnetic control traction sheave brake is characterized by comprising an inverted-cone hollow sleeve and an inverted-cone magnetic top block, wherein the outline of the inverted-cone magnetic top block is matched with the inner shape of the hollow sleeve. The hollow sleeve is arranged on one side of the top block in a coaxial mode. An electromagnet which is in mutual attraction with the top block is arranged on the other side of the top block. A braking bar which can only move along the radial direction is arranged on the side wall of the hollow sleeve in a penetrating mode. According to the electromagnetic control traction sheave brake, traction sheave braking is achieved by electromagnetic attraction and withdrawing of the traction sheave braking is achieved by restoring force of a spring. Therefore, the electromagnetic control traction sheave brake has the advantages of being simple in structure, convenient to operate, accurate in braking location and good in braking effect. Both the length that the top block is inserted into the hollow sleeve and the length that the braking bar is inserted into the hollow sleeve are reasonably adjusted. Moving track directions of the top block and the braking bar can be controlled easily. Stability of the brake is enhanced.