Disclosed is a cold-storage agent that comprises halite, water, and 2-4 wt% of a dry crosslinked cellulose gel obtained by radiating an electron beam at a cellulose mixture paste obtained by mixing water and 15-25 wt% cellulose in a vacuum.本發明是有關一種蓄冷劑,該蓄冷劑是由:將15~25wt%的纖維素與水在真空下進行混練而成的軟膏狀纖維素混練物加以照射電子線而得的乾燥架橋纖維素凝膠2~4wt%、水以及岩鹽所組成的。