Aiming at the problems of traditional fault diagnosis methods, such as poor flexibility, low efficiency, poor scalability and single form of fault alarm information, a remote monitoring and fault diagnosis system based on mobile terminal was developed. The system could collect the running data of industrial robot in real time through Internet and uploaded it to the server. The working state of industrial robot could be viewed anytime and anywhere by using a smart phone to realize remote data monitoring and fault alarm. The results show that through this system, the flexibility of field data query is enhanced, the accuracy of fault diagnosis and the timeliness of field fault treatment are improved.