The invention provides a remote real-time monitoring system for a welding robot system. The remote real-time monitoring system comprises a server, an acquisition terminal and a programmable logic controller. The server, the acquisition terminal and the programmable logic controller establish a local area network through a wired Ethernet, and communication among the server, the acquisition terminal and the programmable logic controller is performed by virtue of the local area network. The acquisition terminal comprises an OPC communication module for acquiring real-time welding data acquired from the programmable logic controller. The acquisition terminal is used for uploading the real-time welding data to the server at a preset frequency. Compared with the prior art, the remote real-time monitoring system has the advantages that information interaction among the server, the acquisition terminal and the programmable logic controller is established through the wired Ethernet, the real-time welding data is acquired by using the programmable logic controller and is uploaded to the server by virtue of a network interface of the acquisition terminal, so that a user can remotely monitor on-site welding data in real time only through a browser. In addition, the on-site programmable logic controller and a welding robot are upgraded and maintained through VPN service.