The invention discloses a gas-sensing characteristic response curve test device. The bottom of the sample carrier is provided with a heating plate, and the top surface of the sample carrier is used to carry the gas-sensitive material to be tested; the flange is provided with a first air inlet pipe, a second Two air inlet pipes and air outlet pipes, wherein the outlet end of the second air inlet pipe is connected with a universal bamboo pipe, and the first air inlet pipe and the second air inlet pipe are located above the sample carrier, and the universal bamboo pipe is close to the sample carrier. Top surface; the inner cover is a transparent cover, and the inner cover covers the sample carrier, the heating plate, the first probe, the second probe, the first air inlet pipe, the second air inlet pipe, the air outlet pipe and the universal bamboo tube , and the opening end of the inner cover is fixed to the outer circular surface of the flange, and the inner cover and the flange are sealed by an o-ring. In this case, on the basis of the existing structure, a non-detachable transparent inner cover is added. The inner cavity of the inner cover is insulated from the outside, so that the gas-sensitive material to be tested can be isolated from the temperature of the outside world, thereby avoiding the temperature of the outside world. Effect on gas-sensing properties.