In the process of rapid popularization and development of network information technology in China, new network environments have begun to emerge, especially in the cloud computing environment. Network forms have changed, service types are diversified, application and delivery models are very complex, and computer networks need to follow the cloud The demand for computing provides dynamic and easy‐to-expand virtualized resources. However, in the actual application of such virtualized resources, security risks often occur, which seriously affect the computer network security under the cloud computing environment. This analysis is aimed at Cloud computing also studies the security problems faced by computer networks in the cloud computing environment, and proposes several technical measures for network security protection, aiming to provide help for enhancing the computer network security in the cloud computing environment.