FIELD: chemical industry. SUBSTANCE: described is method of preparing suspension polyvinyl chloride in the presence of protective colloid and monomer-soluble initiator. In addition to main initiator method comprises addition, after pressure starts to fall in reactor, of initiating system consisting of hydrogen peroxide-sodium thiosulfate at weight ratio of components of 1: 1 in amount of 0.001-0.1 % of monomer weight of each component, and polymerization process is subsequently continued for 1.3 h. EFFECT: increased yield of desired product and improved quality characteristics of polymer. 1 tbl
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