The invention discloses a surface-contact outdoor AC high-voltage disconnecting switch. The disconnecting switch comprises an insulator, moving and static contact seats fixed on the insulator, static contacts fixed on the static contact seat, a moving contact fixing on a moving contact seat and a guiding sleeve; the static contacts are fixed in the inner side of the guiding sleeve; the static contacts include a main static contact and an auxiliary static contact in sliding cooperation; the main static contact is fixed on the static contact seat; the static contact seat is connected with a binding post; and the moving contact is in axial connection with the other end of the guiding shaft, and the moving contact makes surface contact with the static contacts. The disconnecting switch has the advantages that a surface contact manner increases the contact area and reduces the resistance of a contact surface, it is ensured that currents flow smoothly, and phenomena as spark discharge are prevented; and the moving contact makes direct contact with the static contacts, and defects of too many contact points and unreliable contact when the moving contact is connected with the static contacts via other conductors are overcome.