Preparation method of high-flowability and high-heat-resistance transparent polyvinyl chloride alloy capable of being subjected to injection molding

The invention belongs to the technical field of polyvinyl chloride, and particularly relates to a preparation method of a high-flowability and high-heat-resistance transparent polyvinyl chloride alloy capable of being subjected to injection molding. The transparent polyvinyl chloride alloy comprises the following components in parts by mass: 90-100 parts of polyvinyl chloride, 5-10 parts of a silane coupling agent, 3-5 parts of an impact modifier, 2-3 parts of a heat stabilizer, 5-10 parts of a flow modifier, 0.2-0.5 part of a heat-resistant anti-reflection modifier, 0.1-0.4 part of polyethylene wax, 2-4 parts of stearic acid and 2-4 parts of metal oxide. The invention also provides a specific material and a specific preparation method. According to the invention, the defects of the existing polyvinyl chloride alloy are overcome, stearic acid and metal oxide are utilized to form a dispersion and in-situ conversion system, good dispersity is formed, the lubricating effect is excellent, and meanwhile, the stear