Method for preventing distributed denial of service attack and related equipment

A method for preventing distributed denial of service attack, applied in a target service provider server, a platform server, and a botnet service provider server, the method comprising:

• the target service provider server directing a data flow of a network equipment in an enterprise network to a first cleaning center of the target service provider server and controlling the first cleaning center to identify an attack flow from the data flow according to a first flow rule;
• the target service provider server sending the identified attack flow to the platform server;
• the platform server receiving the attack flow sent by the target service provider server, and regarding the received attack flow as a malicious traffic;
• and
• the platform server determining a botnet service provider server containing the malicious traffic in a permission list stored in the platform server, generating an attack report, and sending the attack report to the botnet service provider server to notify the botnet service provider server to clean or filter the malicious traffic.