The utility model discloses a real-time monitor for the operation states of pressure plates of a protective screen. The monitor comprises a control loop, a relay, a monitoring loop, a protective screen door, a door frame and a monitoring center, wherein the control loop is formed by connecting a relay, a control power supply and a magnetic switch successively, and the monitoring loop is formed by connecting a relay, a monitoring power supply and a network camera successively. The magnetic switch comprises a magnet and a tongue tube, the tongue tool is arranged on the frame, and the magnet is arranged on the protective screen door in correspondence with the tongue tube. The monitoring center comprises a PC, and the network camera is connected with the monitoring center. According to the utility model, when workers onsite operates the pressure plates, a remote technician can discover arrangement mistakes via remote monitoring and thus directs the workers onsite to make correction timely, it is ensured that the pressure plates are input and output correctly, the operation results are stored, and problems are convenient to discover when a fault occurs later.