Abstract: The present disclosure relates to the technical field of air purifiers, and in particular to a gradually-changing twin-turbocharged suction purifier. The gradually-changing twin-turbocharged suction purifier includes a housing combination, a twin-turbocharging assembly, a filter screen cylinder combination and a rotary end cover, wherein the twin-turbocharging assembly is mounted inside the housing combination, the filter screen cylinder combination is disposed between the housing combination and the twin-turbocharging assembly, the twin-turbocharging assembly includes a top screen combination, a large fan combination, a cone-shaped small fan combination, an internal support combination and a power connection box combination. A cone-shaped gradually-changing air channel is adopted between the large fan combination and the small fan combination to reduce surge and noise of air flow. Under the same purification performance conditions, the purifier of the present disclosure may generate the smallest noise.