The invention discloses a steel pipe outer wall oiling device which comprises a base, a shell, a pumping mechanism, a motor and a steel pipe fixing mechanism. The pumping mechanism comprises a rotaryplate, a connecting rod, a pushing rod, a cylinder body and a piston; an arc-shaped placement plate is arranged at the left end of the inner side of the shell; and a steel pipe fixing mechanism is arranged at the right end of the inner side of the shell, and comprises pressing plates, support rods, a sleeve, a rectangular through slot, first sleeve rings, second sleeve rings, a bi-directional threaded rod, a support side plate, a rotary plate and a second threaded sleeve. The steel pipe outer wall oiling device provided by the invention is novel in design; when the first sleeve rings move faceto face or opposite to each other under the action of the bi-directional threaded rod, the support rods drive the multiple pressing plates to spread or contract, so that a steel pipe can be fixed anddisassembled, and the convenience in use is realized; during the oil injection process, the steel pipe is driven to rotate so as to be oiled uniformly; and a collecting groove communicates with the pumping mechanism and is used for collecting and recycling redundant anti-rust oil dripped on the steel pipe and sprayed by a spray head.