The invention provides an air atomizing nozzle with an adjustable spray cone angle. The air atomizing nozzle comprises an air atomizing nozzle body, a liquid spray part and a spray cone angle adjusting part; the liquid spray part is provided with a liquid spray channel communicating with the air atomizing nozzle body, and a plurality of communicating ports formed in the extension direction of theliquid spray channel; the spray cone angle adjusting part is provided with a plurality of telescopic spray pipes and adjusting panels; the adjusting panels are provided with a plurality of spray ports; one of each telescopic spray pipe rotationally communicates with the corresponding communicating port in a matched mode, and the other end of each telescopic spray pipe rotationally communicates with the corresponding spray port in a matched mode; and the lower ends of the adjusting panels are rotationally connected to the air atomizing nozzle body. By pushing the adjusting panels, the telescopic spray pipes rotate around the liquid spray part, thus, the spray cone angle (namely the included angle between the adjusting panels) is adjusted, and the applicability of a spray gun to paint with different viscosities and the spraying precision are improved.