▎ 摘　　要

NOVELTY - Preparation method of flame retardant foam comprises (S1) dividing polyether polyol into two parts, heating and dehydrating one part under vacuum condition to obtain dehydrated polyether polyol, (S2) adding the remaining polyether polyol, polyester polyol, additives and water to a reaction kettle and stirring until uniformly mixed to obtain a mixed solution, (S3) mixing the dehydrated polyether polyol, the mixed solution and isocyanate, reacting under a protective atmosphere and after finishing reacting, adding graphene to obtain a mixture and (S4) foam coating and drying the mixture on a base film to obtain the flame retardant foam. USE - The method is used for preparing flame retardant foam (claimed). ADVANTAGE - The preparation method is simple and easy to operate. The flame retardant foam has balanced flame retardant properties, foaming uniformity, and mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the flame retardant foam prepared by the above method.