Reducing import tariffs on high-tech products is both a powerful measure for China to fulfill its commitment to expand opening-up. It is of great significance for promoting high-level scientific and technological self-reliance and self-improvement through the development of high-tech industries. Using a computable partial equilibrium model, the economic impacts of China’s high-tech products import tariff reduction is examined at the industry level. It is found that: the promotion effect of China’s high-tech products import tariff rate reduction on imports is greater than exports, the effect increases incrementally with the increase in the magnitude of the tariff reduction, and the higher the existing tariff rate, the greater the trade effect of the tariff reduction; domestic sales and consumer prices of China’s high-tech products will decrease, but producer prices and production do not change much; China’s high-tech industry has a substantial increase in the consumer surplus, the magnitude of changes in producer surplus is limited, and government import tariff revenue declines significantly, so the social net welfare of high-tech products will be reduced, of which the net welfare loss of radio, television and communication equipment products is the largest, office, accounting and computer equipment products and aerospace products have a smaller net welfare loss. The results of the study can provide a basis for the adjustment of China’s tariff policy on high-tech products, and also provide reference for China’s proactive expansion of import policy formulation.