Safe adjustable air duster

The utility model discloses a safe adjustable air duster which comprises a duster body and a duster handle. A first flow channel is formed in the duster handle. An opening and closing piece capable of controlling the size of the caliber of the first flow channel is arranged in the first flow channel. The duster handle is hinged to the duster body, linked with the opening and closing piece and provided with a fixing block. Multiple locating holes are formed in the fixing block and distributed in an arc shape. The distribution track of the locating holes coincides with the motion track of the duster handle. The duster body is provided with a locking piece which can lock or unlock the duster handle through the corresponding locating hole. The corresponding locating hole is locked or unlocked rapidly through the locking piece, so that the use safety of the air duster is improved, loss caused by mistaken opening is avoided, the different locating holes are locked through the locking piece, and therefore the air outflow of the air duster is adjusted.