The invention discloses a zinc smoke gas collecting hood in the technical field of gas collecting hoods. The zinc smoke gas collecting hood comprises a galvanizing tank. A smoke collecting hood body is arranged on the top of the galvanizing tank. Extraction openings are evenly formed in the inner wall of the smoke collecting hood body. A gas stop circular ring is arranged on the top of the inner wall of the smoke collecting hood body. Through the arrangement of the smoke collecting hood body, zinc smoke outside the top of the galvanizing tank can be collected; the collecting strength for zincsmoke can be enhanced through the evenly-distributed extraction openings, and the zinc smoke is not prone to leakage; through stopping of the gas stop circular ring, zinc smoke risen when a galvanizedworkpiece is thrown into the galvanizing tank is not prone to flying out along the inner wall of the galvanizing tank, meanwhile, the gas stop circular ring can adsorb smoke near the smoke collectinghood body, and smoke is not prone to diffusion; through the arrangement of a gas collecting pipe, an outer hose can be connected, through connection of the hose and outer smoke treatment equipment, throwing of the galvanized workpiece into the galvanizing tank cannot be influenced when the device collects the zinc smoke, and the throwing efficiency of the galvanized workpiece is improved.