The invention discloses a
powder spraying process which comprises the following steps: S1, spraying bottom
powder on the surface of a workpiece to obtain a bottom
powder coating; s2, spraying surface powder on the surface of the bottom
powder coating in the S1; and s3, baking the surface of the workpiece obtained through spraying in the S2, and solidifying the base powder and the surface powder; the base powder mainly comprises
epoxy resin,
polyurethane resin, a sand texture agent and an auxiliary agent; the surface powder mainly comprises
polyurethane resin, a sand streak agent and an auxiliary agent; and the percentage content of the sand streak agent in the bottom powder in the total
mass of the bottom powder is smaller than the percentage content of the sand streak agent in the surface powder in the total
mass of the surface powder. The base powder and the surface powder both contain the sand streak agent, the sand streak agent in the surface powder accounts for a large percentage content of the total
mass of the surface powder, the surface
powder coating is firstly heated and cured, convex and concave sand streaks are formed on the interface of the surface powder and the base powder, and the interface area of the base powder and the surface powder is larger than the
coating area, so that the
adhesive force between the base
powder coating and the surface powder
coating is increased; and the adhesion between the coatings is tighter, and meanwhile, the orange peel phenomenon is reduced.