The invention discloses an automatic welding machine for ear straps of a face mask. The automatic welding machine for the ear straps of the face mask comprises a rack. An equipment platform is arranged on the rack, a mask conveying mechanism, a thread feeding mechanism, a thread winding mechanism, a thread shearing mechanism, a welding mechanism, a stacking mechanism and a controller are arrangedon the equipment platform, and the thread feeding mechanism, the thread winding mechanism, the thread shearing mechanism and the welding mechanism are arranged above the mask conveying mechanism. Thestacking mechanism is arranged at the output end of the mask conveying mechanism, the mask conveying mechanism comprises two chain wheel supports, a driving double-chain wheel and a driven double-chain wheel, two parallel and tensioned chains are arranged between the driving double-chain wheel and the driven double-chain wheel, and the two chains are both located on the surface of the equipment platform. A plurality of flat plate type mask carriers are transversely and evenly laid on the two chains. The automatic welding machine for the ear straps of the face mask has the beneficial effects that the conveying positioning precision is high, the average transmission ratio is accurate, the transmission is stable, the efficiency is high, the transmission power is high, the overload capacity ishigh, the high-speed performance is excellent, and maintenance and debugging are convenient.