Muffle furnace with high safety

The utility model discloses a muffle furnace with high safety, relates to the field of heat treatment of industrial workpieces, and aims at solving the problems that in the prior art, in the heating process of the muffle furnace, internal heat insulation materials are monitored in real time, and timely power-off treatment can be carried out. Supporting legs are arranged on the outer surface of thelower end of the muffle furnace outer shell. The number of the supporting legs is four. A locking device is arranged on the outer surface of one side of the muffle furnace outer shell; a muffle furnace door is arranged on one side of the muffle furnace outer shell; a door lock is arranged on the outer surface of one side of the muffle furnace door; a hearth furnace blocking block is arranged on the outer surface of one side of the muffle furnace door; a PID regulator outer shell is arranged on the outer surface of the upper end of the muffle furnace outer shell; a PID regulator is installed in the PID regulator outer