Bearing for X-ray tube

The invention discloses a bearing for an X-ray tube, which comprises a bearing core and a bearing sleeve, at least one ball bearing is arranged between the bearing core and the bearing sleeve, the bearing for the X-ray tube further comprises at least one pair of sealing rings, and the ball bearing comprises an outer ring and a plurality of ceramic balls. The multiple ceramic balls are connected between the outer ring and the bearing core in a rolling mode, the side, away from the ceramic balls, of the outer ring is connected with the bearing sleeve in an interference fit mode, the pair of sealing rings abut against the two sides of the outer ring respectively, and a sealing space used for containing the ceramic balls is jointly formed among the pair of sealing rings, the outer ring and the bearing core. And the sealed space is filled with liquid metal so as to improve the heat dissipation efficiency of the bearing and reduce the working noise of the bearing at the same time. The bearing provided by the invent