Method for preparing hydrogenated copolymer from conjugated diene hydrogenated latex

The invention provides a method for preparing a hydrogenated copolymer from a conjugated diene hydrogenated latex. The method comprises the following steps: mixing a part of a conjugated diene latex with a Hoveyda-Grubbs II catalyst so as to obtain a mixture A; mixing the residual conjugated diene latex, the mixture A and a composite auxiliary agent so as to obtain a mixture B, wherein the composite auxiliary agent is a combination of two or more selected from the group consisting of sodium oleate, potassium oleate, sodium tetradecenylsulfonate, potassium tetradecenylsulfonate, linear alkyl sulfate and alkyl betaine; introducing nitrogen into the mixture B, carrying out stirring and degassing treatment, and continuing stirring treatment so as to obtain a mixture C; and heating the mixtureC, introducing hydrogen, and carrying out a hydrogenation reaction so as to obtain the hydrogenated copolymer. According to the invention, through a batch-adding mixing mode, introduction of a specific composite auxiliary age