The utility model relates to an oil bag, pertaining to the field of storage devices. The oil bag is provided with an upper adhesive tape of a bag body, a lower adhesive tape of the bag body and a sealing oil mouth. The four sides of the upper adhesive tape of the bag body and the lower adhesive tape of the bag body are connected by heat seal. The oil bag is characterized in that after the upper adhesive tape of the bag body and the lower adhesive tape of the bag body are subjected to heat seal, the four angle-sealing parts have structures in that the upper adhesive tape of the bag body and the lower adhesive tape of the bag body are inserted into a U-shaped groove of a U-shaped sealing adhesive strip after being connected by heat seal and are integrally connected with the U-shaped sealing adhesive strip; a fan-shaped adhesive mat is arranged at the upper side of the upper adhesive tape of the bag body of the four angle-sealing parts in a heat seal mode after heat seal of the upper adhesive tape of the bag body and the lower adhesive tape of the bag body; and a thin-sheet-type sealing adhesive strip is arranged at the fan-shaped adhesive mat in a heat seal mode at the bending part of the upper adhesive tape of the bag body. The oil bag has following beneficial effects: the oil bag is simple in structure of heat seal; and high pressure-bearing capability, pressure-tightness, durability, and using performance of a container-like product subjected to heat seal are effectively ensured in such a manner that the angle-sealing parts of the container-like product are subjected to heat seal.