A portable data reading device comprises a telescopic rod, a camera, a display screen and an insulating handle. The insulating handle is installed at the lower end of the telescopic rod. The camera is arranged at the upper end of the telescopic rod. The display screen is installed at the lower portion of the telescopic rod and connected with the camera. The portable data reading device can enable an operation and maintenance person to read a numerical value of a pressure gage on a GIS device on the ground in real time and avoid personal injury accidents, misoperation and other ricks caused by climbing, body going into a GIS device gap and careless touch on electrified device, improves the safety and operability of the numerical value reading work of the pressure gage on the GIS device, meanwhile improves device inspection and maintenance quality and facilitates implementation of device operation and maintenance work of operation and maintenance integrated persons in a large base. In addition, the portable data reading device further has the advantages of being simple in structure, convenient to use, capable of achieving quick measurement, convenient to carry and store and the like.