The invention discloses a balancing structure for a long key of a keyboard. The balancing structure comprises a balancing rod and a pair of clamping hooks arranged on a bottom plate of the keyboard, wherein the balancing rod comprises a cross rod matched with a keycap of the key, and two sliding rods which extend from two end parts of the cross rod and are matched with the pair of clamping hooks separately; and during the keycap downward pressing or spring-back process, each of the two sliding rods slides on a clamping port edge on at least one side of the corresponding clamping hook along with the rotation of the cross rod, and a moving trajectory of a contact point of each sliding rod and the corresponding clamping port edge is an arc in the sliding process. According to the balancing structure, the moving trajectory of the contact point of each sliding rod and the corresponding clamping port edge is an arc during the sliding process of each sliding rod, that is, the sliding rod moves along an arc path on the corresponding clamping port edge in the sliding process, buffer is formed in the motion process of the sliding rods, thus direct impact on the clamping hooks cannot be caused and abnormal sounds cannot be produced.