The double-layer louver air outlet is a double-layer adjustable louver-type air outlet. This series of tuyere can be used directly with the fan panel, and can also be used at the end of the central air conditioning system. The blade angle of the tuyere can be adjusted arbitrarily within the range of 0-90°, and the blades can be adjusted to different angles to obtain different air supply distances and different diffusion angles. Blade adjustment tools are ordered separately.