The invention provides a waist board device for an operation table. The device comprises a waist board and two waist board lifting mechanisms which are arranged on the lower portion of the waist board and used for lifting the waist board, and each waist board lifting mechanism comprises an installation base, a first linkage, a second linkage and a fixed base used for fixing the waist board, wherein a hydraulic cylinder is arranged on the installation base, the first linkage comprises a first upper connecting rod, a first middle connecting rod and a first lower connecting rod which are hinged in sequence, the second linkage comprises a second upper connecting rod, a second middle connecting rod and a second lower connecting rod which are hinged in sequence, the bottoms of the first lower connecting rod and the second lower connecting rod are hinged to the installation base, the first middle connecting rod is hinged to the second middle connecting rod through a hinged shaft, a piston rod of the hydraulic cylinder is vertically hinged to the hinged shaft, the tops of the first upper connecting rod and the second upper connecting rod are hinged to the fixed base, and a limiting mechanism which is used for limiting the maximum lifting height of the waist board and preventing the waist board from rotating is arranged below the fixed base. Compared with the prior art, the waist board device positions the waist board through the limiting mechanisms, and the device is simple and reliable.