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As an important part in the development and test of spacecraft, high-precision and high-reliability temperature acquisition and monitoring plays an important role in guiding the design and improvement of spacecraft. In order to meet the requirements for temperature collection and testing of the internal environment and equipment of the spacecraft, abandon the traditional sensor wired wiring method, optimize the assembly cycle of the whole device, reduce the weight of the temperature measurement system, and improve the reliability of the system, a precision light-weight wireless temperature measurement system is analyzed and designed. The system can collect the temperature signal of each measuring point, and then transmit the signal to the upper computer through wireless network for data analysis and real-time temperature display after arithmetic processing. After that, the performance index and function of the system were verified, which proved that the temperature measurement system has the characteristics of light weight, long standby time, high precision, long transmission distance and high reliability, which can meet the requirements that the weight of the single-channel temperature acquisition system is less than 2g and the standby time is no less than 240 hours, and can monitor and analyze the internal environment and equipment temperature of the spacecraft in real time.