The invention discloses a radar level instrument easy to disassemble. The radar level instrument easy to disassemble comprises a radar level instrument body, an antenna box and a microwave transmitting needle, wherein the antenna box is arranged on the bottom of the radar level instrument body, the microwave transmitting needle is arranged on the bottom of the antenna box, a connector is fixedly arranged on the outer side of the microwave transmitting needle, the connector is closely connected with a hatch opening through the microwave transmitting needle, and the antenna box is fixedly connected with the hatch opening through a fixing device. The fixing device comprises a clamping plate I and a clamping plate II, one end of the clamping plate I is connected with one end of the clamping plate II through a hinge, the other ends of the clamping plates I and II are provided with fixing blocks respectively, the two fixing blocks are provided with positioning blocks respectively, and undercooperation of the two fixing blocks, the positioning blocks are fixed through limiting rings. Through the arrangement of the connector and the fixing device, the radar level instrument body can be closely connected with the hatch opening, and disassembly and installation are facilitated.