The invention discloses hot air drying equipment for a corrugated case printing machine. The hot air drying equipment structurally comprises a draught fan, side supporting plates, a dehumidification pipe, control panels and a drying box, wherein the draught fan is fixedly installed at the top of the drying box, the side supporting plates are welded to the side ends of the drying box, and the dehumidification pipe is fixedly installed at the upper ends of the side supporting plate in an embedded manner. In the drying process, hot air is guided into conduction pipes through air inlets in the front ends of connecting supporting plates, so expansion films expand and swell, at the moment, the angle between swinging plate bodies increases, the four outer sides of a corrugated plate are propped open, magnetic attraction is carried out through second magnetic blocks on laminating plates and first magnetic blocks, meanwhile the laminating plates rotate around positioning shafts, when the laminating plates are attached to the surfaces of the swinging plate bodies, collision plates and the surfaces of the swinging plate bodies maintain laminating strength, the traction on the outer side on the corrugated plate is improved, large shrinkage occurring to the corrugated plate in the drying process is prevented, and ink printing gelatinization of the corrugated plate during drying is avoided.