Primer is an adhesive material used when applying hot-melt paint for road markings. Primer plays a role in preventing film peeling and improving the adhesion between the film and the road surface. Primer truck is an auxiliary equipment for hot-melt marking construction. The machine uses a gasoline engine as power and is equipped with an automatic air compressor device for spraying, which improves work efficiency and reduces labor intensity. It is designed to be noiseless, pollution-free, and has a spray gun holder guide rod lifting and lowering function. The spray width adjustment is accurate, convenient, easy to operate, maintain, and has a long service life.