The invention discloses a webpage debugging method, device and system, and belongs to the technical field of networks. The method is applied to a remote server; the remote server and a first terminalare positioned in different networks; furthermore, on the basis of the internet, communication connection between the remote server and the first terminal is established; the remote server and a second terminal are connected to the same network; the first terminal is a user terminal; and the second terminal is a terminal used by a webpage developer. The method comprises the steps of: receiving kernel data sent by the first terminal, sending the kernel data to the second terminal, and generating and sending a debugging instruction by the second terminal according to the kernel data; and, receiving the debugging instruction sent by the second terminal, sending the debugging instruction to the first terminal, and executing the debugging instruction by the first terminal, so that webpage debugging is realized. According to the webpage debugging method, device and system disclosed by the invention, a front-end developer can obtain the kernel data of the first terminal through the transfer capability of the remote server; therefore, fault reason data is precisely located; a lot of manpower and material resources can be saved; the application range is relatively wide; and the intelligenceis better.