The invention provides a motor holder, a motor assembly and an electrical fishing reel with the motor assembly. The electrical fishing reel with a simple structure can prevent liquid from penetrating in the outer side surface of the motor holder. The motor holder of the electrical fishing reel installs a motor on the main body of the electrical fishing reel, and the motor comprises a cylindrical motor housing with a bottom, wherein one end of the housing is opened, and the other end supports an output shaft. The motor holder comprises a cover portion and a connecting portion, wherein the cover portion is arranged on the main body of the electrical fishing reel and has a joint recess jointed with the outer periphery of one end of the motor housing, and a bottom for sealing the opening, and the connecting portion connects the outer periphery of the motor housing.
