A method for manufacturing chlorine dioxide gel includes the steps of: (1) dissolving peg-copolymer bis-decyltetradeceth in hot water to form an aqueous solution of peg-copolymer bis-decyltetradeceth； (2) heating the aqueous solution of peg-copolymer bis-decyltetradeceth obtained in the above step to form a gel like colloid； (3) dissolving pure chlorine dioxide gas in water to form an aqueous solution of chlorine dioxide； and (4) uniformly mixing the aqueous solution of chlorine dioxide and the colloid of peg-copolymer bis-decyltetradeceth to form a chlorine dioxide gel, whereby with the above steps, a method for manufacturing chlorine dioxide gel that stably preserves chlorine dioxide gas in a gel is provided. Step (2) may be carried out by heating the aqueous solution of peg-copolymer bis-decyltetradeceth to 90ºC. Step (4) may be carried out when the colloid of peg-copolymer bis-decyltetradeceth has been cooled down to 30ºC.
