The invention relates to the technical field of artificial intelligence, and discloses a plastic greenhouse with an automatic watering function based on artificial intelligence. The plastic greenhouse comprises a floor and a power supply module, wherein two sides of the top of the floor are fixedly connected with two sides of the bottom of a support frame; water collecting grooves are separately formed in two sides of a cavity of the floor; height sensors are separately mounted on two sides of the inner wall of the bottom of each water collecting groove; the bottom of each water collecting groove is fixedly connected with a connecting seat; the bottom of each connecting seat is fixedly connected with one end of a water guiding tube; the other end of each water guiding tube is fixedly connected with one side of a water guiding joint; and the top of the water guiding joint is fixedly connected with a water draining tube. According to the plastic greenhouse with the automatic watering function based on artificial intelligence, the water collecting grooves, the connecting seats, the water guiding tubes, the water guiding joint and the water draining tube are used in a matched manner, water can be injected in a water outlet tube in a using process, normal watering of watering heads is ensured, water shortage is avoided, and the culturing effect on melons, fruits and vegetables is ensured.