The invention discloses a combined type rotary furnace with a safety protection function. The combined type rotary furnace comprises a supporting frame, a feeding groove is fixed to the top of the supporting frame, an adjusting device is fixed below the feeding groove and comprises a protection shell and a plurality of air cylinders, the protection shell sleeves the exterior of the feeding groove,a plurality of fixing pieces are welded to the bottom of the protection shell, air cylinders are welded below the fixing pieces and are arranged at the top of the supporting frame, a high temperaturefurnace is connected to the lower portion of a preheating furnace, a protection frame is welded outside the high temperature furnace, a cooling furnace is connected to the lower portion of the high temperature furnace, and the peripheries of the cooling furnace and the protection frame are both welded to the supporting frame through fixing supports. The protection shell and the air cylinders areadditionally arranged below the feeding groove, the angle of the feeding groove can be adjusted by adjusting the air cylinders, looseness of the feeding groove is avoided, and damage to the feeding groove is not prone to occurrence; and the protection frame is welded to the exterior of the high temperature furnace, the protection effect can be achieved, a worker cannot be in contact with the hightemperature furnace, and the safety of the worker is improved.