The invention provides a multifunctional coating barrel. The multifunctional coating barrel comprises a barrel body and a barrel cover, wherein rollers are arranged at the bottom of the barrel body; a plurality of protective projections which are made of rubber are uniformly arranged on the barrel cover; a discharging valve is arranged at a position, which is close to the bottom, of the barrel body; the barrel body is a double-layer structure with an insulating sandwich layer; an anti-collision ring sleeves the barrel body; and the inner diameter of the anti-collision ring corresponds to the outer diameter of the barrel body. The valve is arranged at the position, which is close to the bottom, of the barrel body of the multifunctional coating barrel, so that coating can flow from the valve conveniently and is saved; by universal wheels, the coating barrel can move at any time and in any places, so that the labor is saved; by the insulating sandwich layer, the coating in the coating barrel is seldom affected by the temperature of the outside, so that the performance of the coating is not affected; and by the anti-collision ring and the protective projections, a certain buffering and protecting effect is achieved, and the circumstances that coating barrels are extruded mutually in a conveying process so that pits are formed in surfaces of the coating barrels or the coating barrels are damaged and economic loss is caused are avoided.