Steel plate continuous heat treating furnace

The utility model relates to a steel plate continuous heat treating furnace, which comprises a steel plate continuous heat treating furnace body, a self-preheating burner heating system, a combustion-supporting air supply pipeline system, a gas pipeline system and a smoke exhaust system, wherein the combustion-supporting air supply pipeline system comprises a combustion-supporting fan, a main air pipe and an air pipeline. The steel plate continuous heat treating furnace is characterized in that the main air pipe of the combustion-supporting air supply pipeline system is communicated with a hot air transmission pipeline which is communicated with a hot air source; a first switch valve is arranged on the hot air transmission pipeline; and a second switch valve is disposed on the main air pipe of the combustion-supporting air supply pipeline system and positioned between the combustion-supporting fan and a position on the main air pipe connected to the hot air transmission pipeline. The steel plate continuous heat treating furnace has the advantages of simple structure and capability of performing low temperature tempering heat treatment.