The utility model belongs to the power equipment field especially relates to a portable on - -spot electricity inspection device. Including the host computer and with host computer electric connection's primary current sample thief and secondary current sample thief, primary current sample thief and secondary current sample thief symmetry set up the both sides at the host computer, through data transmission line electric connection between primary current sample thief and secondary current sample thief and the host computer, data transmission line suit is compared with prior art in folding mechanism, the utility model discloses an advantage lies in with positive effect, the utility model discloses a portable on - -spot electricity inspection device, utilizes including folding mechanism wraps up in the data transmission solenoid, the effectual injury of having avoided the inspection device to lead to the fact the data line when using or during non - use, the effectual life that has improved.