The invention relates to the technical field of oil paint construction, in particular to a process for carrying out oil paint coating construction on a wall body in building construction. The processcomprises the following steps of S1, processing a base layer; S2, applying an interface agent; S3, applying putty powder; S4, drying the wall body; S5, polishing a wall surface; S6, removing floatingdust; and S7, brush coating. In the construction process, through drying the wall body, moisture in the putty powder can be effectively removed, so that a coating can be well adhered onto the putty powder, and the occurrence of the phenomena of peeling and bubbling is reduced; and in the wall body drying process, after the putty powder is dried, the putty powder is purged by utilizing a high-pressure gas, so that the loosened putty powder easy to fall can be effectively removed, the hidden troubles are removed, and the occurrence of the problems in the follow-up use process is reduced.