The invention relates to an algae collection and disposal device. The algae collection and disposal device comprises an algae suction part, a coarse crushing cavity, a dehydration cavity, a drying cavity, a grinding chamber and an end product storage chamber. As the algae suction part capable of floating is arranged, other parts can be arranged on a garbage collection ship while the algae suctionpart is placed in water to collect algae. The other parts are used for processing algae, so that full-process treatment of algae is realized. Algae serving as pollutants in water can be cleaned, and meanwhile, algae can be also processed and then be used as a medicine, so that harm is turned into benefit.