On-line heating device and method for working roll of magnesium alloy rolling mill and rolling mill

The invention provides an on-line heating device and method for a working roller of a magnesium alloy rolling mill, and relates to the technical field of magnesium alloy rolling, the on-line heating device for the working roller of the magnesium alloy rolling mill is used for being connected with a rack of the magnesium alloy rolling mill and comprises a sliding guide assembly and a heating assembly, and the sliding guide assembly comprises a sliding frame, a sliding guide seat and a driving part; the sliding frame is connected with the heating assembly, the sliding guide seat is connected with the rack, the sliding frame is connected with the sliding guide seat, and the driving part is connected with the sliding frame and used for driving the sliding frame to slide in the length direction of the sliding guide seat. According to the magnesium alloy rolling mill working roll online heating device, the telescopic position of the heating assembly can be accurately positioned, so that the working stroke of the he