Compared to traditional remote monitoring technology based on B/ S model, a remote monitoring method for printing and packaging machinery using HTML5 WebSocket protocol was proposed. The remote monitoring and control system was realized using MFC, HTML5 and JavaScript technology based on WebSocket protocol. Remote monitoring and control experiments were carried out on multiple operating systems. Remote monitoring and control of Mitsubishi PLC was realized through the system. Experimental results showed that this method is feasible and effective.