The invention discloses a gas combustor nozzle. The gas combustor nozzle comprises a nozzle head and an accommodating cylinder; a mounting flange is mounted at one end of the nozzle head; the nozzle head is in tight threaded connection with one end of the accommodating cylinder through the mounting flange; the other end of the accommodating cylinder is tightly connected with a leading pipe; an airinlet pipe is arranged on the side surface of the accommodating cylinder; the leading pipe comprises a gas pipe, a connecting end flange and an exhaust part in sequence from top to bottom; the exhaust part extends into the accommodating cylinder, and is tightly connected with the accommodating cylinder through the connecting end flange; a gap is formed between the exhaust part and the accommodating cylinder to form a gas mixing chamber; the exhaust part is provided with an exhaust hole for exhausting gas; and the tail end of the exhaust part is an airtight blind end. Compared with the prior art, the nozzle can fully mix gas with air to improve the gas combustion efficiency; and the gas can be fully combusted, so that the black smoke generation quantity is low, and the combustion efficiency of the combustor is totally improved.