Since the beginning of 2020, COVID-19 has broken out in Wuhan, China and spread rapidly throughout the country and even worldwide. As of August 5, there have been 18,683,575 cases worldwide. Major economies such as the United States and the European Union have all been hit hard, and the recovery growth momentum of the world economy has been interrupted, and even led to a global economic recession. In this article, we mainly compare China's economic conditions and responding measures, the United States and Canada in the epidemic. Systematically summarize and analyze the impact of the new crown epidemic on the world economy, give targeted solutions to the main problems of various countries, and forecasts and solutions for the economic problems of countries in the post-epidemic era. Control the spread of the epidemic as soon as possible; concentrate human, material and financial resources to overcome the vaccine and carry out large-scale promotion and popularization; formulate scientific plans and policies; realize the scientific and orderly resumption of work, production and school, and realize the full recovery and development of the global economy.