The utility model relates to a checking device for high-temperature bar cut length, which comprises a lifting baffle, a scales and bar transformer roll tables, wherein the lifting baffle is arranged in the bar transformer roll tables; the scale is fixed on the backplate surface of the roll table; and the lifting baffle is located at the zero position of the scale. The length of the high-temperature bar can be accurately measured; the operation is simple; the efficiency is high; hidden dangers such as getting burnt do not exist; and the device is suitable for measurement and checking for online high-temperature bar cut length.