Under-mine portable pneumatic wrench

The invention discloses an under-mine portable pneumatic wrench and belongs to the field of under-mine installation tools. The under-mine portable pneumatic wrench is provided, a portable pneumatic gas tank convenient to carry is utilized for providing gas for a pneumatic wrench body, and therefore the pneumatic wrench body can still be used when no gas source can be found under the mine. According to the adopted technical scheme, the under-mine portable pneumatic wrench comprises the pneumatic wrench body and the portable pneumatic gas tank. The pneumatic wrench body comprises a pneumatic motor, a speed reducer and a handle. The pneumatic motor is connected with one end of the speed reducer through a connector, the handle is provided with a gas switch, the gas switch is connected with the pneumatic motor through a pipeline, the handle is further provided with a gas inlet, the gas inlet is connected with the gas switch through a pipeline, and the other end of the speed reducer is connected with an output head