The invention discloses a heating rod used for a critical heat flux density test. The heating rod comprises a nickel rod, a heating tube, a nickel tube, a copper tube, a ceramic member, copper sheets and thermocouples. The heating tube, the nickel tube and the copper tube are fixedly connected in a butting and sealing way in turn so as to form a rod body with a hollow structure. The nickel rod is connected with external upper live equipment. The copper tube is connected with external lower live equipment. The ceramic member is attached to the internal wall of the rod body and surrounds so as to form a heat cavity. The copper sheets are evenly and transversely arranged in the heat cavity and positioned in the heating tube. The thermocouples are arranged in the heat cavity in a suspension way and fixed by the copper sheets. The heating rod used for the critical heat flux density test is high in heating temperature, high in heat flux density and compact in structure so that the requirements of the critical heat flux density test can be met. Besides, temperature parameters are measured and outputted via the thermocouples in real time so that simulation of nuclear fuel heat release can be accurately realized and the requirements of the critical heat flux density test can be effectively met, critical heat flux density of a nuclear fuel rod under different operation conditions can also be measured, and thus the heating rod used for the critical heat flux density test has a great supporting effect for research and development of new type of nuclear fuel assemblies.