To provide a plastic combustion burner for an arc furnace that as plastic, having an economic size of several mm to several tens of mm is used, heat obtained through combustion of plastic in an arc furnace can be utilized effectively for melting of scraps.

In a plastic combustion burner for an arc furnace provided with a flow passage 10 through which plastic is conveyed by gas, such as air blown in an arc furnace, a fuel flow passage 11 for oil or gas, etc., and a combustion blowing nozzle 13, an oxygen flow passage 12 through which oxygen is blown in the arc furnace, and an oxygen blowing nozzle 14; a cooling water passage 15 for cooling a combustion burner; and a combustion cylinder 16 extending between a burner tip and a furnace wall, a burner tip part is formed into a recessed shape and a fuel-blowing nozzle 18 for oil or gas and an oxygen blowing nozzle 19 are disposed in the protrusion part of the recessed part.