Gas circulation device for testing performance of gas sensitive sensor

The utility model relates to a gas circulating device for testing the performance of a gas sensitive sensor, which comprises a gas sensitive sensor testing device, the gas sensitive sensor testing device comprises a base and two testing hosts, and the two testing hosts are oppositely and fixedly arranged at the top end of the base. When the gas-sensitive sensor testing device is used for testing a gas-sensitive sensor, the adjusting assembly and the limiting assembly are matched with each other, so that testing gas only flows in the fixed cylinder and the limiting cylinder, the gas-sensitive sensor can be replaced when the gas flows out of the fixed cylinder or the limiting cylinder, and the testing efficiency is improved. When the gas sensitive sensor is replaced, almost no test gas flows out of the device and is diffused into the outside air to influence the operation environment of an operator, so that the test gas is prevented from being diffused into the outside air to influence the operation of the oper