Testing device for testing photocatalytic denitrification performance of cement-based material

The utility model relates to a testing device for testing photocatalytic denitrification performance of a cement-based material, which comprises a leakage-proof box and a reaction box arranged in the leakage-proof box, the reaction box is connected with a gas supply component, and the leakage-proof box and the reaction box are respectively connected with a gas concentration detection component. The reaction device further comprises a base, the reaction box and the leakage-proof box are both arranged on the base, and a closed space is defined by the leakage-proof box, the reaction box and the base. The device is reasonable in design, solves the problem of poorer sealing performance due to bolt fixation through the mutual matching of the leakage-proof box, the reaction box and the base, and is convenient to operate and long in service life due to the sealing mode; the gas concentrations in the reaction box and the leakage-proof box are respectively detected, so that whether gas leakage occurs in the test proces