Blade deicing mechanism, blade assembly and fan

The utility model relates to the technical field of fans, and provides a blade deicing mechanism, a blade assembly and a fan. The blade deicing mechanism comprises a web plate, a blower device, a heating device, a guide device and a backflow cavity, the inner space of a blade is divided into a first cavity and a second cavity by arranging the web plate, and the blower device, the heating device, the guide device and the backflow cavity are arranged in the first cavity arranged close to the front edge of a windward side; and hot air in the blade can reach the blade tip position of the blade to deice the blade, and the hot air flows back after being cooled, so that air flow in the blade circulates. According to the blade deicing mechanism, the blade assembly and the fan, heating and deicing are conducted on the blade, especially the blade tip position in a circulating airflow mode, and the blade deicing mechanism has the advantages of being simple in structure, easy to machine and install, high in heating effic