The invention discloses a fire-resistant test system for a reinforced concrete cantilever beam component. The fire-resistant test system comprises a test furnace device, a counter-force framework, a cantilever beam test component, a cantilever beam transverse clamping device, a cantilever beam vertical clamping device, a cantilever beam loading device, a sensor and a control and data acquisition device. The fire-resistant test system for the reinforced concrete cantilever beam component disclosed by the invention can be used for monitoring a temperature in a furnace in real time, and can regulate the temperature at any time, so that a fired working condition of the reinforced concrete cantilever beam component can be simulated better; the fired condition under a three-way constraint condition and a stress strain change rule of the reinforced concrete cantilever beam component can be researched, and the condition that the reinforced concrete cantilever beam component generates deformation failure under a fire hazard condition can be simulated to the greatest extent, so that bearing performances of the cantilever beam test component can be researched through acquired test parameters,and therefore, data support is provided for a condition about whether the cantilever beam test component can continuously bears or not and collapse failure occurs at a moment that the cantilever beamtest component bears to the greatest extent.