The invention discloses a dual-heat-accumulation step type walking beam furnace water seal tank, which comprises skirt covers, a scrap scraping component and a water seal tank body. Upper ends of thescrap scraping component and the skirt covers are fixedly arranged on the bottom surface of a heating furnace, lower ends of the scrap scraping component and the skirt covers are positioned below theliquid level in the water seal tank, the crap scraping component are positioned between the left and right skirt covers, and the crap scraping component and the skirt covers are mutually independentlywhile gaps are reserved. The dual-heat-accumulation step type walking beam furnace water seal tank has advantages that due to mutual independence between the scrap scraping component and the skirt covers, the skirt covers cannot be structurally damaged when the scrap scraping component is stressed, long integral structural service life and high stability are realized, and less proneness to waterleakage caused by damages of the water seal tank is realized.