Aiming at the problem of the operating parameters on the atomization of snow by internal mixed gas-liquid two-phase flow nozzles in snow-making machines, an artificial snow-making environment simulation room is set up, and the experimental study on the snow density of a new type of internal mixed gas-liquid two-phase flow nozzles with different operating parameters is carried out. Based on the snow crystal growth theory, the effect of operating parameters on the snow density of the atomizing nozzle is revealed, which provides theoretical support for the design and optimization of the snow-making machine. The snow density change rule of the atomizing nozzle under different air-water pressure ratio and wet bulb temperature is studied, and the main conclusions show that: the air-water pressure ratio is 0.4 MPa:0.4 MPa, 0.5 MPa:0.45 MPa, 0.5 MPa:0.4 MPa, and under the same ambient temperature condition, the reduction of the air-water pressure ratio can improve the snow density; the wet bulb temperature varies in the range of -20.23- -5.36 ℃, and the snow density changes in the range of -20.23- -5.36 ℃, under the same conditions of air-water pressure ratio, increasing the wet bulb temperature can improve the snow density.