Automatic irrigation dust-washing machine

Disclosed is an automatic irrigation and dust-washing machine which automatically performs irrigation when the soil turns dry and automatically sprays water to wash away dust when the dust becomes thick. The humidity of soil and the thickness of dust covering flowers and trees are detected at regular intervals; if the humidity of soil or the thickness of dust exceeds the set value (the soil is too dry or the dust is too thick), an electromagnetic valve (or a pump) is started up to spray water for irrigation and dust washing, and the water spraying stops when the prolonged time for water spraying (hereinafter referred to as discharge time, which is set according to the actual situation) is up. The water spraying time is delivered with a design of double time control (namely double insurance) so as to completely eradicate the accident that the water flow can not be stopped due to machine faults. After the humidity of the soil is set, perennial management is unnecessary, and the machine can automatically regulate and control the wetness of the soil: the temperature in summer is high and the water in leaves vapor quickly, so the wetness of the soil increases; on the contrary, the wetness of the soil is reduced in winter, thereby ensuring that the flowers and trees grow well and are clean without dust. The automatic irrigation and dust-washing machine of the invention is characterized by full automation, simple use and management, low power consumption, water saving, labor saving and expenditure reduction and ensures landscaping and flower and tree management to progress towards modernization gradually.