The invention relates to a battery-powered multi-dimensional force strain sensor fault diagnosis system, an MSP430 single-chip microcomputer is used as a core, a constant current excitation and matrix scanning survey method is adopted for realizing the fault diagnosis for all channels measuring circuits of the multi-dimensional force strain sensor, and the system comprises a hardware system and a software system. The hardware system is formed by a power supply management module, a constant current excitation module, a matrix switch scanning module, a signal conditioning module, a signal processing and controlling module, a logic control module and a man-machine interface module. The software system separately adopts a threshold value comparison method and a look-up table method in a fault scanning process to diagnose the short-circuit fault and open-circuit fault of the sensor, and a multiple circulation scanning method is adopted to distinguish the short circuit/virtual short circuit and open circuit/virtual open circuit fault condition according to the times of fault occurring. According to the invention the system can realize the online automatic detection for short circuit, virtual short circuit, open circuit, virtual open circuit fault of at most 8 channels of all channels measuring circuits of the multi-dimensional force strain sensor, and the system is battery powered and portable.