The invention provides a head adjusting device used in a bronchoscopic operation. By means of the head adjusting device, the head of a patient who suffers from the bronchoscopic operation can be conveniently fixed and adjusted, and the operative efficiency and quality are improved. According to the technical scheme, the head adjusting device comprises a bed board, clamping plates are arranged on the bed board, an arc-shaped sleeve which can move up and down is installed on the bed board, a rotary shaft is arranged on the bed board, a rectangular block is arranged on the lower portion of the bed board, and the rotary shaft is sleeved with a sliding sleeve. A plurality of positioning key grooves which are uniformly distributed along the circumference are formed in the side wall, matched withthe sliding sleeve, of the rectangular block, and positioning keys are arranged on the outer circle of the sliding sleeve. In an initial state, the highest point of the arc-shaped sleeve is not higher than the upper surface of the bed board, the positioning keys are inserted into the positioning key grooves, a supporting rod is connected between the lower portion of the clamping plate on the rearside and the sliding sleeve, the clamping plates slide backwards to drive the sliding sleeve to move backwards, when the sliding sleeve slides backwards, the positioning keys can be made to be separated from the positioning key grooves, at this moment, the rotary shaft can rotate, and the arc-shaped sleeve can be driven through gear-rack meshing to move up and down. The head adjusting device is original in conception and ingenious in structure.