The invention discloses a low-NOX combustion technology coupling active ammonia synergistic denitration device for a coal-fired industrial boiler. The low-NOX combustion technology coupling active ammonia synergistic denitration device comprises a low-NOX combustion technology assembly and an active ammonia synergistic denitration assembly. According to the low-NOX combustion technology coupling active ammonia synergistic denitration device, the low-NOX combustion technology is mainly adopted, recycled flue gas is fed into different positions of a hearth in a layered mode, layered control is implemented, the recycled flue gas and ascending airflow are fully mixed, and therefore the standing time of the ascending airflow in the boiler is prolonged, generation of nitric oxide is reduced, andthe initial emission concentration of the nitric oxide is reduced; meanwhile, an online monitor feeds the concentration of the nitric oxide in the flue gas at an outlet of the boiler back to a central controller, the central controller is automatically coupled with active ammonia for synergistic denitration based on the monitoring result, the influence of the type of the boiler and the temperature in the boiler is avoided, the investment is small, the consumption of carbon-based reducing agents, water and energy is small, the operation cost is low, the occupied area is small, the emission value of the nitric oxide is controlled to be 50mg/Nm <3> or below, the denitration efficiency reaches up to 80% or above under the low operation cost, and the increasingly strict emission standard is met.