Large out-opening window with excellent air tightness

The utility model provides a large out-opening window with excellent air tightness, and relates to the technical field of window frames. The utility model discloses a large out-opening window with excellent air tightness. Window frame and window sash, the window sash comprises a window frame and glass fixed in the window frame. A first-level groove and a second-level groove are formed in the side,facing the window frame, of the window frame at intervals. A connecting rod sliding support is arranged in the first-stage groove, a plurality of lock catches used for locking the window sash and thewindow frame are arranged between the window sash and the second-stage groove, the lock catches are at least arranged on the two symmetrical side edges of the window sash at intervals, and the lock catches are in linkage to achieve unlocking of the window sash. The door lock has the advantages of being good in sealing performance, convenient to unlock, easy to open and ingenious in structural arrangement. 本实用新型提供了一种气密性优异的