The invention provides a device used in production of fruits and vegetables in a greenhouse based on electrolyzed functional water and an application method. The device comprises the fruit and vegetable greenhouse which is provided with a skeleton, the skeleton is connected with a group of opening hanging rings which are fixedly connected with hanging cylinders, the tops of the hanging cylinders are connected with tension springs, adjusting hanging rods are inserted into the hanging cylinders, and the tension springs are connected with the adjusting hanging rods. The bottoms of the adjusting hanging rods are connected with circular ring sleeves, the left sides of the inner circles of the circular ring sleeves are connected with left rail boards, left trapezoid-section sliding grooves are formed in the left rail boards, the right sides of the inner circles of the circular ring sleeves are connected with right rail boards, and right trapezoid-section sliding grooves are formed in the right rail boards. Water spraying pipes for spraying the electrolyzed functional water penetrates through the insides of the circular ring sleeves, the left sides of the water spraying pipes are connected with left elastic plates which are connected with left trapezoid-section elastic sliding plates, and the left elastic sliding plates are installed into the left trapezoid-section sliding grooves andslide; the right sides of the water spraying pipes are connected with right elastic plates which are connected with right trapezoid-section elastic sliding plates, and the right elastic sliding plates are installed into the right trapezoid-section sliding grooves and slide. The device is suitable for spraying the electrolyzed functional water on the fruits and vegetables in the greenhouse.