Coplanar sliding show window

The utility model provides a coplanar sliding show window. The coplanar sliding show window comprises a support, an openable external decorative cover, a fixed base, a guide rail and a show window body, wherein the support is installed on an installing structure, one end of the openable external decorative cover is connected to the support in a rotary mode, the fixed base is fixed to the installing structure, a four-bar linkage is connected between the fixed base and the guide rail, the show window body is connected to the guide rail, and the openable external decorative cover is of a right-angle shape. According to the coplanar sliding show window, the aluminum alloy show window body in the middle plays a role as a window frame and also plays a role as a window sash, and the show window body serves as the window frame for a sliding window at the outermost position, and serves as the window sash for a fixing frame at the bottom; adjustment can be carried out according to different requirements, the coplanar s