The invention discloses a video monitoring system based on a computer network, which comprises a client, a terminal camera device, an event server, a video recording server, a network server, an application server, a database server, etc., wherein the application server is respectively connected with the event server, the video recording server, the network server and the database server through the computer network, and exchanges data with the servers. By using the application server to conduct the data relay among the servers, the entire video monitoring system becomes convenient, fast, safe and reliable.