The utility model discloses a quick drying device for the inner wall of a gas cylinder. The device comprises a base, a bracket, a pressure spring, a branch pipe and a resistance wire, an arc-shaped groove for positioning a gas cylinder is machined in the upper surface of the base, and a groove is machined in one end of the base. The support is formed by welding a sliding block and a supporting plate above the sliding block, the sliding block can slide in the groove under the action of a pressure spring, and a hole for the branch pipe to move up and down is machined in the supporting plate. Each branch pipe is composed of a steel pipe, a resistance wire, a fixing plate, a nut and an insulation heat preservation layer. Threads matched with nuts are machined at one end of a steel pipe, a fixing plate is welded to the tail portion, an insulating layer is wound outside the steel pipe, and a resistance wire is wound on the insulating layer. The device is simple in structure, simplified in operation, uniform in drying, labor-saving, high in production efficiency and better in drying effect especially in winter.