The invention relates to a method for producing polyvinyl chloride resin and particularly relates to a method for producing polyvinyl chloride paste resin. The method for producing polyvinyl chloride paste resin comprises the steps of mixing an initiator, a vinyl chloride monomer, soft water and an emulsifier, dispersing by virtue of a homogenizing device into droplets, in the presence of an oil-soluble initiator, carrying out polymerization reaction for 15-20 hours at 40-60 DEG C in a polymerization reaction vessel to form polyvinyl chloride latex, wherein the initiator, vinyl chloride monomer, soft water and emulsifier are blended as follows: the emulsifier accounts for 1.3-2.3% of the weight of vinyl chloride monomer; the initiator accounts for 0.01-0.05% of the weight of vinyl chloride monomer; and the soft water accounts for 100-105% of the weight of vinyl chloride monomer. Compared with the prior art, the polyvinyl chloride paste resin is high in paste viscosity and the finished products prepared from the polyvinyl chloride paste resin have the advantages of high tensile strength and large elongation.