The invention relates to train berths, in particular to an adjustable high-speed railway berth. The adjustable high-speed railway berth includes a compartment wall, a lower berth body, a middle berthbody, an upper berth body, a horizontal sliding block, a horizontal support, a first bed board, a sliding rail, a vertical sliding block, a vertical support, a second bed board, a third bed board andbolts; the sliding blocks are mounted in a horizontal sliding groove and a vertical sliding rail which are formed in the compartment wall, the supports are mounted on the sliding blocks, and a bolt hole is formed in the vertical sliding block; by changing the position of the bolt hole, the vertical sliding block is moved, and then the vertical positions of the vertical support are changed; by moving the horizontal sliding block, the position of the horizontal support is changed, the position of the third bed board can change along with the movement of the sliding block, therefore, a spatial distance between the middle berth body and the upper berth body and a spatial distance between the upper berth body and the top of a train are increased or reduced, and then activity space of passengersis changed; further, by using the characteristics of a scissor-type mechanism, the distance between the lower berth body and the ground of the train is changed, and therefore it is convenient for thepassengers to place luggage.