The water rescue thrower is a product specifically developed for the use of drones in water rescue. When used in conjunction with drones, it can quickly deliver life-saving equipment to the person who has fallen into the water in the first instance in case of water danger. Compared with the traditional one-time throwing rescue method, it can first pre-throw the lifebuoy through a cable, and then expand into a standard lifebuoy upon contact with water. Then, it is precisely towed to the hands of the person who has fallen into the water by a drone for a second drop.