The invention discloses a meter reading device of a portable infrared electric energy meter and a working method thereof, relating to a meter reading auxiliary device of a portable infrared electric energy meter and a working method thereof. The meter reading device can be used for conveniently reading a meter in an infrared way and effectively shielding intense light interference and mutual interference of signals among a plurality of meters. The meter reading device comprises a telescopic rod, a handheld terminal and a meter reading head, wherein the meter reading head is detachably connected to the top end of the telescopic rod and connected with the handheld terminal through a data line; the meter reading head comprises a shell and an infrared signal receiving and transmitting circuit arranged in the shell; an infrared transmitting end and an infrared receiving end are arranged on the infrared signal receiving and transmitting circuit; and light-guiding cylinders are arranged outside the infrared transmitting end and the infrared receiving end so that infrared signals of the infrared transmitting end and the infrared receiving end are transmitted through the light-guiding cylinders. According to the invention, the light-guiding cylinders can effectively avoid interference of sun light and is in one-to-one correspondence to the electric energy meter to be read and avoid interference between the electric energy meter and an adjacent electric energy meter.