The invention discloses a high-pressure direct injection type double-layer fine mist spray head. The spray head comprises a spray head cap (1), an atomization plate (2), a whirl plate (3), a guide post (5), a shunt plate (6), a spray head seat (8), a filter cylinder (10), a clamping ring (11) and a filter screen (12). High-pressure water current rotates regularly at a high speed along a circular whirl cavity formed by the whirl plate and the conical part of the shunt plate under the guide of a flow guide slot of the whirl plate so that the water mist sprayed from an outer nozzle has the characteristics of high speed, uniform distribution and the like; a double-layer fire extinguishing nozzle greatly increases the atomization angle of the spray head and improves the atomization range, and the water current still has high axial motion quantity so that the mist drops can penetrate the fire field space to realize deep fire extinguishment; and circular water films are unstably broken more easily under the action of the air through the circular outer nozzle so that good atomization effect is achieved. The spray head also can be applied in the fields of agricultural pesticide spraying, food processing, medicinal treatment and the like besides the fire fighting field.