The present invention discloses a method, device, terminal equipment and system for monitoring user's access behavior, relates to the Internet technical field, and has the main object to solve the problem that depending on the user unique ID, a sever will be caused to monitor the same session separately when different session IDs of different terminal equipment are associated by the sever. The main technical solution of the present invention comprises: a second terminal equipment acquires a first session ID and a URL of the target landing page when a first terminal equipment is switched to the second terminal equipment to carry on accessing the same website; the second terminal equipment jumps according to the URL of the target landing page, and replaces the second session ID with the first session ID; the second terminal equipment sends the first session ID to a server, so that the server can monitor user's access behavior based on the first session ID. The present invention is generally applied to the process of monitoring by the server the user's access behavior across the equipment.