The invention provides a polyvinyl chloride (PVC) film blowing machine and belongs to the technical field of film blowing machines. By the adoption of the PVC film blowing machine, the problem that in the prior art, the film blowing efficiency is low is solved. The PVC film blowing machine comprises a base. A first mounting plate and a second mounting plate arranged in parallel are fixed to the base. A mounting frame is detachably arranged between the first mounting plate and the second mounting plate. A melting mechanism capable of melting raw materials is arranged on the base. A film blowing mechanism capable of flowing out film materials is arranged on one side of the melting mechanism. A cooling mechanism capable of cooling the film materials is arranged below the film blowing mechanism. A third drawing roller is arranged above the cooling mechanism. A cutting mechanism capable of cutting off leftovers is arranged above the third drawing roller. A recycling mechanism capable of recycling waste materials is arranged above the cutting mechanism. A first pressure roller and a second pressure roller are further arranged between the first mounting plate and the second mounting plate. A collecting mechanism capable of coiling the film materials is arranged on one side of the first pressure roller and the second pressure roller. The PVC film blowing machine has the advantage that the film blowing efficiency is high.