Safety isolation device

The utility model relates to the technical field of cold rolling, in particular to a safety isolation device. The device comprises a frame which is adjacently arranged on the front face of a hearth manhole and comprises a first part and a second part which are vertically arranged; the isolation door is provided with a ventilation hole communicated with the manhole, and is arranged in the frame in a manner of moving up and down so as to be switched between the first part and the second part, and when the isolation door is arranged in the first part, the isolation door covers the hearth manhole; the locking assembly comprises a first lock catch, a second lock catch and a padlock, when the isolation door is arranged in the first part, a first lock hole of the first lock catch coincides with a first lock hole of the second lock catch, and a lock hook of the padlock can be arranged in the first lock hole of the first lock catch and the first lock hole of the second lock catch in a penetrating mode so as to connect