Fan structure with speed-measurement function

The invention relates to a fan structure with a speed-measurement function, and particularly relates to the fan structure with the speed-measurement function according to which a speed-measurement gear disc is directly arranged on a fan. The fan structure mainly solves the problems in the prior art that the fan is separated from a speed sensor; the speed-measurement gear disc is arranged on a motor shaft, so that the motor shaft direction space needed by the structure is large, and the manufacture cost of a motor is increased; and more severely, a motor design scheme cannot be adopted because of limitation of motor assembly space, weight and cost. The fan structure comprises the speed-measurement gear disc and a detection head device, and is characterized in that the speed-measurement gear disc is embedded in the outer diameter of the fan through an inner hole; and the detection head device is arranged on the external end cover of the speed-measurement gear disc or a corresponding position on an engine base.