The invention discloses a locating device which comprises an adhesion manipulator and a locating clamp. The adhesion manipulator is provided with a rotating shaft, a rotating arm and two disc suction heads, wherein the rotating arm is vertically installed on the rotating shaft, and the disc suction heads are installed at both ends of the rotating arm and have a same distance with the axis of the rotating shaft. The locating clamp comprises a clamp main part and a clamp secondary part, wherein the clamp main part is provided with an installation hole corresponding to the rotating shaft, station holes are respectively arranged at both ends of the clamp main part, the distance between each station hole and the center of the installation hole is equal to the distance between each disc suctionhead and the axis of the rotating shaft, and the clamp main part is in matching connection with the clamp secondary part to fix the clamp main part on the rotating shaft and relieve fixation. Becausethe locating clamp has the advantages of simple structure, convenient use, low cost and strong universality, the horizontal position and the symmetry of the disc suction heads of the adhesion manipulator is regulated by using the locating clamp with simple and rapid regulation, low cost and high regulation accuracy. In addition, the invention also discloses a locating method.