The utility model relates to a multifunctional back barrel, which comprises barrel body and back strap. The barrel body of pig kidney shape adapts to back of human body, and customerfrees his hands and does all types of hand work when the barrel is held on back of the customer. The utility model can be loaded with both solid and liquid substance. The utility model has the advantages of proper design, simply structure, multifunction al, easy production and low cost. Through changing fastening method and position of the back strap, the utility model can be hold on fore chest, on back and on side. The utility model is suitable for generalization.