The invention discloses a portable light pneumatic pin driving device. The portable light pneumatic pin driving device comprises a sliding supporting device and a control system, a pin driving devicebody and an electromagnetic adsorption device are arranged on the sliding supporting device, the electromagnetic adsorption device and the pin driving device body are arranged oppositely and located at the two ends of the sliding supporting device correspondingly, and the pin driving device body comprises a piston assembly; a through hole which can allow the piston assembly to penetrate is formedin the middle of the electromagnetic adsorption device; and the control system controls connection with the pin driving device body and controls reciprocating motion of the piston assembly in the pindriving device body. The pin shaft mounting and demounting operation efficiency in site work is improved, the labor intensity of workers is reduced, the safety risk of pin shaft mounting and demounting is reduced, and single-person operation of pin shaft mounting and demounting is realized.