The invention relates to a water-lubricating bidirectional working thrust bearing device which is mainly structurally composed of a bearing seat, preloaded springs, a track ring plate, a lower balance block, pin rollers, an upper balance block, thrust bearing bushes, thrust pads, positioning pins and a thrust head. A thrust bearing is of an upper-lower symmetrical structure. The thrust pads are tightly pressed on the surface of the thrust head through the preloaded springs at the two ends by means of the thrust bearing. A motor bottom cover, the bearing seat and a sleeve are tightly pressed in a motor engine seat bearing chamber through bolts in the axial direction. The thrust head is adjusted to move up and down through a gap between the bearing seat and the track ring plate by means of the thrust bearing. When the thrust head moves up and down, the preloaded springs push the track ring plate, the pin rollers, the balance blocks, the bearing bushes and the thrust pads to move in a follow-up manner, and the unique bidirectional work thrust bearing device is formed.