The invention relates to the technical field of motors, and specifically relates to an asynchronous motor fault detection system. The asynchronous motor fault detection system is composed of sensors, a signal conditioning circuit, an A/D analog-to-digital conversion circuit, an MCU and an LCD which are connected in sequence, wherein the sensors are directly connected with a motor. According to the invention, a high-performance 32-bit ARM microprocessor is adopted, and an embedded system is introduced into the motor fault detection system. The fault of the motor can be monitored on site, the fault can be removed effectively, the efficiency of fault handling is improved, and the economic loss is reduced. On the basis of meeting the performance requirements, the ARM embedded system is of low cost and high cost performance. The application of the embedded system in motor fault detection has a good application prospect.