Profiling spraying device and profiling spraying method for automobile parts

The invention relates to an automobile part profiling spraying device and a profiling spraying method. The device comprises a transferring assembly and a profiling spraying assembly. The profiling spraying assembly comprises an annular support, and the transferring assembly penetrates through an inner hole of the annular support. An arc-shaped rail, a sliding block and a driving assembly are arranged on the annular bracket; a transverse rod, an elastic piece and a position sensor are longitudinally arranged on the sliding block in a sliding mode, a first paint spraying head and a profiling roller are arranged at the two ends of the transverse rod correspondingly, and the distance between the first paint spraying head and the profiling roller is equal to the distance between the front ends of the adjacent automobile parts on the transferring assembly. A plurality of obliquely downward second paint spraying heads are annularly distributed at the upper part of the first paint spraying head; a paint supply assemb