Control method, device and equipment of plasma arc melting furnace and storage medium

The embodiment of the invention relates to a control method, device and equipment of a plasma arc melting furnace and a storage medium, the melting furnace is used for treating secondary hazardous waste, the melting furnace comprises a constant current source, a first electrode and a second electrode, the constant current source is connected with the first electrode and the second electrode, and output current of the constant current source is introduced into the furnace through the electrodes. The method comprises the steps that the heights of a first electrode and a second electrode are adjusted till the first electrode and the second electrode make contact with secondary hazardous waste in a melting furnace; wherein the surface of the secondary hazardous waste is covered with an arc striking agent; after the arc striking succeeds, adjusting the output current of the constant current source based on the arc voltage and the temperature in the furnace; if the in-furnace temperature meets the second preset con