The invention provides a method and device for recognizing a main website. The method comprises the following steps: under the condition of receiving an access request of a website, adding the website into an access queue; judging whether the duration for the website at the beginning of the access queue reaches a predetermined duration or not; if yes, judging whether the website number taking the website at the beginning of the access queue as a source reaches a predetermined quantity or not; if yes, determining the website at the beginning of the access queue as a main website. The method and the device, provided by the invention, are compatible to all browsers, can be used for accurately recognizing the main website under the condition of ensuring influences on system performance, and can provide conditions for relevant operations based on the execution of the main website.