The invention relates to a steel tube deoiling machine, which comprises a stand, a support bar, an outer rubber ring limit plate and an inner positioning core, wherein the support bar is arranged on the left side of the stand; the lower end of the outer rubber ring limit plate is vertically fixed on the right part of the upper surface of the stand; the left end of the inner positioning core is fixed at the top of the support bar; a manual operation gap is reserved between the right end of the inner positioning core and the outer rubber ring limit plate; an inner rubber ring is arranged at theright end of the inner positioning core; an outer rubber ring is arranged on the outer surface of the right part of the inner positioning core; a steel tube passes through a through hole of the upperpart of the outer rubber ring limit plate and then is inserted to the inner positioning core; the inner and outer rubber rings are in contact with the inner and outer surfaces of the steel rube respectively; the steel tube is moved leftwards and rightwards to finish deoiling operation; and an oil containing tank is arranged below the inner and outer rubber rings. As oil produced in the deoiling of the cold-rolled steel tube can be recycled and the steel tube does not need washing with the aqueous solution of nitric acid or hydrofluoric acid, the steel tube deoiling machine of the invention realizes the zero discharge of wastewater, solves the problem of environmental pollution, saves management cost, greatly reduces the overall production cost and improves the market competitiveness of enterprises.