Afterheat recycling device for steel slag

The invention discloses an afterheat recycling device for steel slag. The problem that an afterheat recycling system is not configured in a procedure of processing steel slag by using a rotary drum method is solved. The afterheat recycling device comprises a rotary drum, wherein the front end of the rotary drum is rotatably connected with a slag feeding barrel; the rear end of the rotary drum is rotatably connected with a slag discharging barrel; the slag feeding barrel and the slag discharging barrel are fixed motionlessly and the rotary drum is rotated; a hollow cavity is formed in the rotary drum wall; a second hollow cavity which communicates with the hollow cavity is formed in the slag feeding barrel wall; a third hollow cavity which communicates with the hollow cavity is formed in the slag discharging barrel wall; the second hollow cavity is connected with a steam pipe net through a first heat pipe; and the third hollow cavity is connected with a water supplementing pipe througha second heat pipe. Accor