Waste ash and slag leaking from the bottom of the furnace are generated when incineration in a grate furnace is used tor garbage disposal. The furnace bottom ash leakage and slag conveying system and equipment designed according to its characteristics and process characteristics have the advantages of strong pertinence, good adaptability, good sealing, stable and reliable operation. The process layout and equipment combination are flexible and reasonable, and can transport bottom ash leakage and slag of various types of grate furnaces. The main equipments of the system are: scraper machine, ash cooling screw machine, ash leakage conveyor, pneumatic double flap valve, expansion joint and slag extractor.