The invention belongs to the technical field of waste gas treatment, and in particular relates to a waste gas treatment device for carbon fiber production and a method thereof, and aims at the problemthat direct discharge of the existing waste gas treatment device has certain adverse effects on air and direct discharge of harmful gases contained in the waste gas causes harm to human bodies, the waste gas treatment device comprises a treatment box, wherein one side of the treatment box is communicated with a filter box, the filter box is communicated with a waste gas inlet, and an activated carbon filter plate is arranged in the filter box. A plurality of spray heads are arranged on the inner wall of the top of the treatment box, a water pump is arranged on the top of the treatment box, one side of the treatment box is communicated with a water tank, a water inlet pipe of the water pump is communicated with the water tank, and a water outlet pipe of the water pump is communicated withthe plurality of spray heads. The waste gas treatment device has simple structure, convenient operation and convenient operation, can filter residue particles in the waste gas and avoid air pollutioncaused by direct discharge, and can filter and remove the harmful gases in waste gas at the same time.