Self-locking type casement window lock

The utility model relates to an article for daily use, particularly to a self-locking type casement window lock, which includes a cavity equipped inner lock sleeve, an inner lock bolt and an outer lock head. Installation ear plates are disposed on both sides of the inner lock sleeve, and the wall plates on both sides of the inner lock sleeve are provided with slide openings. The inner lock bolt has a trapezoidal section and is accommodated in the cavity of the inner lock sleeve. Both sides of the inner lock bolt are provided with press pull rods, which pass through the slide openings. A spring is arranged between the bottom surface of the inner lock bolt and the bottom surface of the inner lock sleeve cavity. The outer lock head is provided with mounting holes, and a hook shaped bulge is formed at one end of the outer lock head. With the characteristics of simple structure and low cost, the self-locking type casement window lock can realize self-locking. The outer lock head and the inner lock bolt are in surf