The invention discloses a combined cabinet used in a kitchen. The cabinet comprises a water sink, a kitchen range hole adjusting device, a countertop, a front water baffle plate and a wall-leaning water baffle plate, wherein the wall-leaning water baffle plate is connected with the wall and a cabinet body; the front water baffle plate surrounds the periphery of the cabinet body; the water sink is in cramp joint with the countertop; a cramp joint plate is arranged on the cramp joint part, and invisible adjusting screws are arranged on the cramp joint plate, and can be used for adjusting the top faces of the cabinet body to be level; a cutting board fixing device is arranged on the water sink, reinforcing plates are arranged below the water sink, and a cutting board is fixed on the cutting board fixing device, so that a user can split, chop or cut food materials; the kitchen range hole adjusting device is sleeved by a kitchen range hole in the countertop and the size of the kitchen range hole adjusting device can be changed according to the specification of a gas stove. In the combined cabinet provided by the invention, the water sink has multiple purposes, the cutting board is fixed on the water sink, then the water sink can bear large impact force, water on the cutting board can flow into the water sink, so that the water splashing all around during the splitting, chopping or cutting process can be avoided, and the size of the kitchen range hole adjusting device can be randomly changed according to the specification of the gas stove; and the top faces of the cabinet body can be enabled to be level.