An automatic regulating device for the heating temperature of a quench machining tool comprises a machine body (1). A temperature induction module (2), a workpiece induction module (3), a remote communication module (4) and a management module (5) are arranged on the machine body (1). During operation, the temperature induction module (2) inducts the temperature changes in the quench machining tool, the workpiece induction module (3) inducts the hardness changes of a workpiece in the quench machining tool, and inducted information is transmitted by the remote communication module (4) to the management module (5) to be processed; a timing module (6) is arranged on the machine body (1) to record the heating time of the workpiece; a prompt module (7) is arranged on the management module (5), and a prompt sound is produced when the inducted temperature or workpiece hardness is abnormal; and damage caused by the inappropriate temperature to the workpiece in the work process of the quench machining tool can be avoided, and the work efficiency of the quench machining tool is improved more effectively.