This utility model provides an assembled height adjustment device and cabinet structure, relating to the field of cabinet structure technology. It includes a side panel with a fixing groove on its surface, a base plate placed on the side panel, and a second fixing groove on the top surface of the base plate. This utility model, by setting up the side panel and fixing groove structure, allows for simple and quick connection and fixing of the device during use through multiple structures such as fixing posts one and two. It eliminates the need for extensive use of screws and nails for fixing components, and reduces the time and effort required. It does not require skilled installers and avoids problems such as insecure installation and excessive gaps between components, effectively preventing issues affecting the overall stability and aesthetics of the cabinet. Furthermore, if subsequent disassembly, repair, or adjustment of the cabinet is needed, the operation is simple and can be completed quickly, further improving the convenience and practicality of the cabinet.