Plastic greenhouse used in summer

The invention discloses a plastic greenhouse used in summer. The greenhouse is in the north and south extending direction and comprises a greenhouse body skeleton and a plastic covering film, the greenhouse body skeleton is composed of greenhouse side beams, a top beam and end face skeletons, and the greenhouse side beams, the top beam and the end face skeletons are of lightweight steel structures. Each greenhouse side beam forms a side face, and an arc-shaped top face composed of the top beam is formed between the side faces. The end face skeletons form two end faces, and two double doors are formed in the centers of the end faces respectively. Side ventilation windows are formed in the side faces, and a top ventilation window is formed in the top face. Through optimization, the top ventilation window is formed in the position away from the end faces on the two sides of the greenhouse by 50 cm and is of a horizontal-pushing type structure or a structure of pushing or pulling toward the top. Through the technical measure of arranging the top ventilation window (namely a cooling skylight), the side ventilation windows and the large-size double doors, the cooling speed of the greenhouse used in summer is increased, cooling and warm-keeping effects are good, and the plastic greenhouse used in summer saves cooling energy for over-summer cultivation of crops, and is simple and reasonable in structure, convenient to use and high in territory practicability.