The invention discloses a braking brake, comprising a first brake arm and a second brake arm arranged at two sides of a brake pulley; a first brake block and a second brake block connected against the brake pulley are respectively arranged on the first brake arm and the second brake arm; one end of the first brake arm and one end of the second brake arm are respectively articulated on a frame; the braking brake also comprises a motor, a screw connected with the output end of the motor; a second nut matching the screw and a tensioning piece; the motor is arranged on the other end of the first brake arm; the second nut is arranged on one end of the screw; the end is far from the motor; the second nut is fixedly connected with the other end of the second brake arm; the screw runs through thesecond nut and the tensioning piece; one end of the tensioning piece is connected with the end of the screw; the other end of the tensioning piece is connected against the second brake arm. The braking brake of the invention is safe, reliable, economic and practical.