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In order to meet the requirement of temperature measurement of propellant for launch vehicle,a high-precision temperature measurement system based on platinum resistance is proposed. Four-wired platinum resistance is used as the temperature sensor,which is driven by a constant current power supply to generate measure voltage. After instrumentation amplifier, signal is collected by high precision AD. Isolation design is adopted among the measurement circuits, which reduces the interference between channels and improves the measurement accuracy. Through self-checking and calibration design, the reliability and accuracy of the system is improved. The test results show that the temperature measurement system is stable and reliable, and the temperature measurement tolerance is less than 0.01℃. The system record the temperature change of the launch vehicle after propellant filling, and provide the measured temperature data for the analysis of flight results.