The invention provides an SIM (subscriber identifier module) card auto-identification device and aims to solve the problems in prior technical schemes for image displaying. The SIM card auto-identification device can identify information in multiple SIM cards in a short time according to different needs and protect information of SIM card holders according to actual conditions. To achieve the technical effect, the SIM card auto-identification device has a hardware structure; the hardware structure comprises a MCU (microcontroller unit) module, a storage module, a power module, a wireless module, a display and operation module, a communication module and a shell structure; a communication connection with a communication service provider where the SIM cards locate is created through the communication module. The SIM card auto-identification device is capable of efficiently and accurately identifying relative information of the SIM cards, such as whether card numbers and phone numbers are normal, and capable of accurately storing recordings. The whole SIM card auto-identification device is simple to operate and use, and a touch liquid crystal interface thereof is clean and clear; the SIM card auto-identification device is moderate in size and convenient to carry and use.