The invention relates to the field of organic matter recovery from gas, and discloses a device and a method for recovering C2 from MTA (methanol to aromatics) byproduct dry gas. The device comprises an absorbent raw material supply unit, a light component removal tower, a gasoline stabilizing tower, a C4 absorption tower and a C4 desorption tower which are connected in sequence, wherein the lightremoval tower and the gasoline stabilizing tower are used for purifying C4 in absorbent raw materials provided by the absorbent raw material supply unit. The method comprises the following steps: performing light component removal on the absorbent raw materials to remove light components of C3 or lower, performing first rectification on the light component removed light absorbent raw materials forseparation to obtain C4 and arene, and contacting obtained C4 with the MTA byproduct dry gas to absorb heavy components of C2 or higher in the dry gas; performing second rectification on a mixture ofthe heavy components of obtained C4 and C2 or higher for separation to obtain C2 and C4. By means of the device and the method, other impurities and metal ions cannot be introduced from the outside of the MTA device, and accordingly, recovery efficiency and product quality are improved.