The invention discloses a portable in-field comparison detector for data of a power user information SIM (Subscriber Identity Module) card. The portable field comparison detector comprises a rectangular insulation box body, a liquid crystal display screen, a base and a circuit board. The portable field comparison detector is characterized in that antiskid handles, which are inwards sunken, are arranged on two sidewalls at the middle lower part of the rectangular insulation box body, a card slot seat of a standard SIM card and a card slot seat of an SIM card for in-field use are arranged on the front plate surface of the antiskid handles, and the corresponding SIM card is inserted and is converted by a switching chip; a charging socket, a switch, a power indicator lamp and a status indicator lamp capable of judging whether the SIM card for in-field use is qualified are arranged on the front plate surface of the base. According to the portable in-field comparison detector for the data of the power user information SIM card, the SIM card for in-field use and the standard SIM card are compared in one machine so as to rapidly judge whether the SIM card for in-field use is qualified, and furthermore, the portable field comparison detector has the advantages of simple structure and convenience for use and carrying, and can be widely used for in-field detection of the power user information SIM card.