Low-temperature catalytic treatment system and method for low-concentration gas-phase pollutants

The invention discloses a low-temperature catalytic treatment system and method for low-concentration gas-phase pollutants. The low-temperature catalytic treatment system comprises a booster pump, a plurality of waste gas storage units, an ammonia gas storage unit and a dissolving tank, wherein the booster pump is communicated with a waste gas source and is used for boosting waste gas; the waste gas storage units can be independently opened and closed; the device further comprises a heating constant-temperature mechanism and a controller. The waste gas is quantitatively supplied after being concentrated, and is mixed in proportion for reaction treatment, so that the low-concentration waste gas can be compressed, and the reaction concentration is improved; and meanwhile, the problem that treatment is discontinuous due to the fact that the waste gas supply amount is smaller than the reaction amount can be solved through the multiple waste gas storage units communicating in parallel, and therefore low-concentrat