The invention discloses an automatic paint spraying achieving method for automobile maintenance. The automatic paint spraying achieving method for automobile maintenance includes the following steps that S1, a maintaining vehicle enters a paint spraying room through a track, and the vehicle is positioned; S2, the paint spraying position is subjected to uniformization grinding, after grinding is completed, attaching and protecting are performed on the periphery of the paint spraying position, and after attaching and protecting are completed, a certain detection landmark is arranged on the boundary of the paint spraying position; and S3, a paint spraying robot performs automatic measurement on the paint spraying position, the measurement can be real-time measurement in the paint spraying process, measurement can also be performed before paint spraying, and after measurement is completed, a spraying gun is controlled to perform paint spraying operation under the condition without measurement according to a measured three-dimensional shape and measured coordinate information. The automatic paint spraying achieving method for automobile maintenance has the beneficial effects that it canbe achieved that after vehicle sheet metal maintenance, automatic paint spraying is performed at the maintained portion, the paint spraying amount, the paint spraying portion and the area are automatically controlled, an automatic paint spraying system replaces manual work, and the paint spraying work of automobile maintenance is achieved.