The invention relates to the technical field of painting make-up equipment, in particular to a metal outer shell painting make-up machine. The metal outer shell painting make-up machine comprises a machining table, a support, a painting make-up mechanism and a direct current power source. A guide rail arranged horizontally is arranged on the support. A sliding base is slidably connected with the guide rail. The painting make-up mechanism is located on the sliding base and comprises a detection rod and a paint tank loaded with high pressure gas and aerosol paint. A spray pipe communicates withthe paint tank. The end, away from the paint tank, of the spray pipe comprises a spray port. The spray port vertically faces downwards. The detection rod is vertically arranged and connected to the sliding base. The detection rod comprises a detection head, a spring and a hollow rod body. The detection head is slidably connected into the rod body. The detection head is connected into the rod bodythrough a spring. The bottom end of the detection head extends out of the rod body. The detection rod and the spray pipe are arranged in parallel. The problem that in the prior art, painting make-up of the positions where paint is peeled cannot be conducted accurately is solved.