Wind speed detecting device

The utility model relates to a wind speed detecting device, which comprises a miniature wind power generator (1), an amplifying circuit (2), a range switching switch (3), a direct current voltmeter head (4), a wind collecting cylinder (5) and a wind wheel (6). The miniature wind generator (1) is connected onto the amplifying circuit (2), an output of the amplifying circuit (2) is connected onto the range switching switch (3), and the range switching switch (3) is connected onto the direct current voltmeter head (4). The wind collecting cylinder (5) is in the shape of a cylinder, the front portion and the rear portion of the wind collecting cylinder (5) are both in the cone shape with two big ends and a small middle, and the middle inner diameter of the wind collecting cylinder (5) is equal to the outer diameter of the wind wheel. The wind wheel (6) is installed on a rotating shaft of the miniature generator (1), and the miniature generator (1) is fixed in the wind collecting cylinder (5) and arranged at the i