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A kind of self-propelled crawler directional air-blowing orchard sprayer was developed. The working principle and transmission line of the machine were introduced firstly. Adopting theoretical calculation, the design of whole structure and the technical parameters of the key components were determined. In order to achieve the directional spraying, the multi-degree of freedom framework was designed. The experiment showed that, compared with no wind spraying, the deposit rate of droplets increased by 42.9% and the coefficient of variation decreased by 18.5%. Compared with ordinary spraying, the number of droplets increased by 30.9% and the coefficient of variation decreased by 55.3%.