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Aiming at the low efficiency and high consumption of traditional car washing, a new self-service car washing machine system based on Internet of things technology is designed and implemented. The system is divided into two parts: car washing machine terminal and cloud server. STM32F103VET6 is used as the main control chip in the car washing machine terminal, and the Hall flow sensor is used to obtain the water flow and realize the flow billing. The GPRS-SIM868 module can realize wireless data communication with the remote server, and collect the state data of the car washing machine with various sensors. At the same time, the cloud server side established UDP communication with the car washing machine terminal to achieve the data acquisition of the car washing machine terminal, and established the B/S data management system with Tomcat as the Web server and MySQL as the database. Users can independently choose payment mode, car washing mode and billing mode according to the information provided by the LCD display of the car washing machine terminal. At the same time, background managers can timely understand the relevant information of the self-service car washing machine through the network, real-time monitoring and management of the car washing machine.