Glue spraying machine for coating

The utility model relates to a glue spray machine for coating, which comprises a material delivery pump 1 of a double-acting pneumatic plunger piston, a glue material box 4, a delivery pipeline 5, a glue coating spray head 6 and control valve assemblies Q1, Q2 of the delivery pump and the spray head. The utility model is characterized in that A reversing mechanism which is composed of a soft rope 1.1, a magnet 1.2 and a two-way switch 1.3 with a sucking sheet is arranged on the material delivery pump of a double-acting pneumatic plunger piston, wherein, the magnet is connected with a piston or a piston rod end in an air cylinder by the soft rope through one end of a top rod 1.4 of the magnet. Because the structure is used by the utility model, thus the volume of the glue spray machine for coating is decreased and the use is more convenient. When the glue material box, the material delivery pump of a double-acting pneumatic plunger piston and the glue coating spray head are combined into a whole, the utility model can become a handheld type spraying and coating tool to adapt to spray works of the site operation class.