Under the background of the COVID-19 pandemic, China's economy has been impacted to a certain extent. With the promulgation of the shutdown policy, domestic consumption and production have stagnated, and the stock index fell to a great extent in the first and second quarters. This study evaluated the impact using the OLS regression method to analyze the relationship between the daily newly confirmed number of COVID-19 in China and the stock index and stock turnover. GDP and consumer confidence indicator (CCI) are also the observation objects of this research. By studying the changes in production, consumption, and investment during the epidemic, this paper explains the epidemic's impact on China's stock market and economy. The result shows covid-19 greatly impacts the production capacity of enterprises and the consumption expectation of residents, resulting in a significant decline in GDP and CCI, leading to the downturn of the economy. The epidemic also has a great impact on the stock market. The stock index will fall every time a new epidemic breaks out, and there is a significant correlation between them. The Chinese government has issued an epic prevention and control policy that forces enterprises to suspend their production and many other business activities. This affected the enterprise's production capacity, made its share price fall, and plunged the stock market into a downturn. However, during the epidemic period, the stock market's trading volume increased significantly due to the reduction of consumption and the instability of enterprise operations.