Abstract: An accessory lock includes a first connection element, a second connection element and a lock device. The first connection element includes a connection portion and a retaining portion connecting with the connection portion, wherein the connection portion has a holding cavity extending in a direction perpendicular with an axial direction of the connection portion. The second connection element has at least one through hole. The lock device includes a retainer disposed in the holding cavity of the connection portion of the first connection element. At a locked state of the accessory lock, the second connection element is retained and held between the retainer and the retaining portion of the first connection element by the retainer while the first connection element passing through the through hole of the second connection element.