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In order to monitor the engine working temperature of small oil-powered drones in real time, a 4-channel temperature monitoring system based on K-type thermocouples was designed and developed. The system uses the analog switch CD4052 for channel switching, the selected thermocouple signal is amplified and adjusted, collected by the STM32F103 controller chip A/D, and DS18B20 digital temperature sensor for cold junction compensation, and finally the temperature value is sent to the Modbus RTU protocol On the 485 bus. After debugging and calibration, the temperature monitoring system is within the normal operating temperature range of the mosquito helicopter MZ202 engine and the temperature gauge of the original machine is ±3℃, the data refresh rate is greater than 2Hz, and the work is stable and the anti-interference ability is strong, which provides for engine tuning. The reliable basis effectively guarantees the safe and stable operation of the engine. The temperature monitoring system can also be used to collect and monitor the cylinder head and exhaust temperature of small piston aero engines such as Rotax582, Rotax912/914.