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With people's extensive attention to the issue of outdoor water safety, more and more water purifier equipment appears on the market. The safe operation of these water purifiers cannot be separated from the control of a stable control system. In order to realize the control of the water purification flow and water purification process of the water purification vehicle, a set of water purification vehicle control system based on STC8 series single-chip microcomputer was developed. The system is mainly divided into two parts: one is to determine the overall control flow of the system according to the water purification process flow chart of the mobile water purifier. The second is that the single-chip microcomputer collects the signals from the liquid level sensor and the flow sensor to control the overall safe and stable operation of the system, and receives and sends data through serial communication to connect the touch screen to complete human-computer interaction. When it is below 50L / H, adjust the frequency of the submersible pump to protect the safe operation of the water purification process, and can realize the characteristics of automatic operation.