Mechanical primer spraying machine is an auxiliary equipment in the construction of hot-melt marking, which is used to spray primer in the pre marking work. Structural features of primer spraying machine: the equipment is powered by gasoline engine, equipped with automatic air pressure device, liftable spray gun frame guide rod. The utility model has the advantages of less energy consumption, low noise, simple operation, flexibility high efficiency, etc. Primer is a kind of bonding material used in the application of hot-melt coating for pavement marking. Primer plays a role in preventing the film peeling off improving the adhesion between the film the pavement. The primer car is the auxiliary equipment for the construction of hot-melt marking line. The machine adopts the gasoline engine device the automatic air compressor device for spraying, which improves the working efficiency, reduces the labor intensity, uses without noise pollution. Spray gun frame guide rod lifting design, adjust spraying width, convenient, with the characteristics of simple operation, maintenance, long service life, etc. Primer is a kind of bonding material used in the application of hot-melt coating for pavement marking. Primer plays a role in preventing the film peeling off improving the adhesion between the film the pavement. The primer car is the auxiliary equipment for the construction of hot-melt marking line. The machine adopts the gasoline engine device the automatic air compressor device for spraying, which improves the working efficiency, reduces the labor intensity, uses without noise pollution. The spray gun frame guide rod lifting design can adjust the spraying width accurately, conveniently, with the characteristics of simple operation, maintenance long service life.