The utility model discloses a PCB solder mask green oil coating machine, mainly comprising an equipment framework, a solder mask coating machine section I, a solder mask coating machine section II and a solder mask coating machine section III. A coating wheel has an effect of flexibly adjusting the radius and the radius of the coating wheel can be changed, so as to realize oil coating adjustment on PCBs having different requirements on thickness, thereby avoiding the trouble in changing hard plastic rollers, saving the production time, reducing the cost, improving the production efficiency and ensuring the uniform and good coating effect; in addition, the height of each upper coating wheel can be adjusted integrally, the distance between two ends of the upper and lower coating wheels can be adjusted; the PCB solder mask green oil coating machine can be disassembled and assembled flexibly, can be cleaned conveniently; two ends of each tapered conveying wheel can support the two ends of a PCB to realize overhead conveying, the problem that the effect of a finished PCB product is poor because oil on the PCB stains the conveying wheel can be avoided. By the PCB solder mask green oil coating machine, the problems of the traditional oil coating machine that the yield of PCBs coated with oil is low and the cost is high can be solved, printing ink can be recycled, waste gas is collected and discharged in a centralized manner, and thus environmental pollution can be avoided.