The work aims to achieve wide coating on the premise of ensuring the uniformity of spray atomization characterization, improve the efficiency of coating, and get uniform and consistent coating of soybean protein. A Particle Image Velocimetry (PIV) was used to take pictures of the spraying atomization field of soybean protein liquid under different interference degrees between two spray nozzles. PIV and origin software were used to process the images, and the speed data were obtained and compared. With the increase of deflection angle between two nozzles, the average velocity at baseline decreased. When the deflection angle was 0°, two spray particles collided at the interference line, and few particles passed through the interference line. The velocity peak on the baseline appeared at different deflection angles of 7°, 0°, and 15°. When the deflection angle was 0°, with the increase of hydraulic pressure, the second velocity valley value on the baseline moved to the right and increased until it disappeared. When the deflection angle is 0° and the hydraulic pressure is 0.24 MPa, the velocity is the most uniform in the interference region at the baseline.