Push-pull fixed sash structure

The utility model discloses a push-and-pull fixed sash structure which comprises a fixed sash, a fixed cover plate and a positioning block, the fixed sash is installed on the fixed cover plate, vertical clamping grooves extending in the setting direction are formed in the two sides of the fixed sash, the positioning block is clamped in the vertical clamping grooves in a matched mode, and the positioning block is detachably connected with the fixed cover plate; the fixing cover plate is connected to the lower rail in a buckled mode, and the lower end of the fixing cover plate makes contact with the upper end face of the lower rail. The fixed cover plate plays a role in linking the fixed sash and the lower track, so that a common push-pull structure and a fixed structure can share one lower track, the material types are reduced, the sharing rate is increased, and the stock pressure is reduced; the fixed sash is directly placed on the fixed cover plate, the lower portion of the fixed sash is completely in contac