The invention discloses an impact-resistant road roller steel wheel excitation structure. A group of excitation structures comprises two fixed eccentric blocks and a movable eccentric block which arearranged on a rotatable excitation shaft in a sleeving manner; the fixed eccentric blocks are fixedly connected with the excitation shaft; the movable eccentric block can relatively rotate around theexcitation shaft; at least one of the opposite faces of the two fixed eccentric blocks is provided with a boss limiting structure capable of limiting the position of the movable eccentric block; the side face, facing the face of the movable eccentric block, of the boss limiting structure forms two limiting faces, and when the large vibration limiting face makes surface contact with one side face of the movable eccentric block, the fixed eccentric blocks and the movable eccentric block are overlapped. When the small vibration limiting face makes contact with the other side face of the movable eccentric block, the fixed eccentric block and the movable eccentric block are located on two opposite faces of the excitation shaft respectively. The limiting structure and the fixed eccentric blocksare integrally formed, a large contact area is provided for the movable eccentric block, the contact stress of the contact surface is reduced, and repeated impact of the movable eccentric block can beborne.