The invention provides a preparation method of an ikebana device. The preparation method comprises the following steps: (1) inserting a porous plug with flowers into the neck portion of a neck containing spherical rubber container filled with water; and (2) fixing the contact surface between the porous plug and the neck containing spherical rubber container by a binding belt; wherein the neck containing spherical rubber container is made of a polyurethane composition, which at least comprises polylactic acid, polyurethane, piperazine dione acid, expanded polytetrafluoroethylene, and microporous silica; the binding belt is made of rubber; and the porous plug is made of EVA foam or high elasticity PE. The provided ikebana device has great advantages in flower package, flower fresh-keeping, flower transportation, and environment protection.