Automatic closing device for screen door

The utility model relates to an automatic closing device for a screen door. The device comprises a screen door fixing plate, a doorframe fixing plate, a spring, a rotating plate and a spring extension plate, and is characterized in that the screen door fixing plate is connected with the rotating plate through a dowel; the rotating plate is connected with the spring extension plate through a dowel; the spring extension plate is connected with the doorframe fixing plate through a dowel; the spring is hooked on the spring extension plate and the doorframe fixing plate. The device has the advantages of simple structure, convenience in use, low cost, easiness in popularization and application and the like, and mosquitoes and flying insects are effectively prevented from entering a room.