Abstract: This design is based on the single-chip microcomputer control of automatic watering system, to achieve indoor potted flower automatic watering, the system can monitor soil moisture, and watering crops timely and appropriate.Took AT89C51 single chip as the control unit, using the LCD1602 for data display, using the YL-69 soil moisture sensor to detect soil moisture, when the humidity is lower than the set lower limit, turn on the pump for irrigation, at the same time turn on the sound and light alarm. When the humidity is higher than the upper limit, turn off the pump and stop irrigation. The button is used to set the upper and lower limit alarm range of the humidity, and has the function of power-off protection. The system realizes the intelligent control of soil moisture through simulation test.