A plastic tube automatic rolling device comprises a main rack, a large rotating arm, a tube bank mechanism, a tension control mechanism, a tube cutting mechanism, a moving caliper assembly, a movable reel loading and unloading working table and a reel conveying mechanism, wherein the large rotating arm, the tube bank mechanism, the tension control mechanism, the tube cutting mechanism, the moving caliper assembly, the movable reel loading and unloading working table and the reel conveying mechanism are arranged on the main rack. The large rotating arm is driven by a motor and a transmission assembly. Two sets of reel assemblies are symmetrically arranged on the large rotating arm left and right, one set of reel assemblies are located on the rolling station, plastic tubes conveyed by a production line pass the tube bank mechanism and the tension control mechanism and then are wound on the reel assemblies, the other set of reel assemblies are located on the reel alternation station and matched with the moving caliper assembly, the movable reel loading and unloading working table and the reel conveying mechanism to finish reel alternation operation, and the two sets of reel assemblies are driven by the large rotating arm to be switched between the rolling station and the reel alternation station. By the adoption of the plastic tube automatic rolling device, labor intensity of operators is relieved, plastic tube rolling time is shortened, and working efficiency of the plastic tube production line is improved.