Adjustable brake power-off clamp

The utility model discloses an adjustable brake power-off clamp, which comprises a clamp and a reed switch, a pull rod is hinged on the clamp, a spring piece is fixed on a handrail through a groove, a screw cap is hinged in the pull rod, a magnet is fixedly mounted on the screw cap, a screw penetrates through the screw cap to be in threaded connection with the pull rod, and a knob is sleeved on the screw cap. The bicycle temperature control device has the remarkable technical effects that firstly, when the reed pipe is applied to a bicycle, the on and off of the reed pipe can be controlled only through the magnet, so that the efficiency is higher, the temperature of the reed pipe is adapted to range from minus 50 DEG C to 150 DEG C, and the application range is wide; and secondly, the position of the reed switch is fixed, after the clamp is installed and the brake cable is adjusted, the position of the magnet is adjusted only by adjusting a knob on the pull rod to carry out corresponding fine adjustment, the