The dissolved air release device is a key device in the pressure dissolved air flotation water purification system, which directly affects the water purification effect and electricity consumption of the air flotation method. The new generation of dissolved air release device has improved the distribution uniformity of the released water, increased the probability of collision and adhesion between microbubbles and impurities in the water to be treated, thereby further improving the air flotation water purification effect. The dissolved air release device is a key device in the pressure dissolved air flotation water purification system. The pressure dissolved air water can only generate a large number of fine bubbles in the water after pressure reduction and energy dissipation through this device.