The invention discloses an automatic resetting device for doors and windows. The automatic resetting device for doors and windows comprises a resetting mechanism, wherein a first installing end is arranged at one end of the resetting mechanism, a second installing end is arranged at the other end of the resetting mechanism, the resetting mechanism retracts under the external force effect to enable the first installing end and the second installing end at initial positions to perform relative motions so as to achieve a close-up action. When external force disappears, the resetting mechanism rebounds to enable the first installing end and the second installing end to perform opposite reverse-direction motions so as to achieve separation actions till the first installing end and the second installing end reset to the initial positions. The automatic resetting device for doors and windows is ingenious in structural design and simple and reasonable in structure, the size is effectively decreased, and the space utilization rate is improved. The automatic resetting device is provided with the resetting mechanism, can automatically achieve the resetting effect and improve the operation comfort degree, is humanized, meanwhile is assembled through a rotation assembly, is easy to dismount, effectively improves the working efficiency of assembly construction or maintenance and is beneficial to wide popularization and application.