The present invention relates to a self-propelled SS spraying device of a two-stage spraying type that allows fine spraying while driving, while spraying the crops located at low or high locations, respectively. The self-propelled SS spraying device of the two-stage injection type of the present invention is a self-propelled SS spraying device capable of driving with a power device by installing a nozzle through which a chemical liquid is injected in a passage through which wind is supplied, and driving with a power device. A driving body equipped with a power device for use； A chemical liquid tank seated in the middle portion of the driving body； An operation unit for an operation installed on the rear side of the chemical liquid tank； It is installed on the front side with respect to the chemical liquid tank, and includes an SS sprayer in which fine spray is performed by installing a chemical spray nozzle through which the chemical liquid is sprayed, and the SS sprayer is installed on one side of the driving body. A power unit for spraying； A vertical frame for the SS spray which is installed vertically on the driving body and has a wind guide guiding to guide the wind in both directions； A chemical liquid injection nozzle unit provided with a plurality of chemical liquid injection nozzles configured to control supply and blocking of chemical liquids respectively installed in both directions so as to be located at the ends of the wind guide openings of the vertical frame for the SS spray； It is composed of a first lower part for supplying wind to a plurality of chemical spray nozzles receiving power from the power unit for SS spraying, and a second lower part located above the first lower part, wherein the first lower part and the second lower part are provided. Each of the parts is configured to include a two-stage fan part configured to be driven by receiving power from the power part for SS spray.본 발명은 주행을 하면서 강력한 바람을 이용하여 미세분사를 하되, 낮거나 높은 곳에 위치한 작물에 각각 분사가 이루어
