The invention belongs to the technical field of hydraulic vibration table and specifically relates to a turning device of a hydraulic vibration table. The invention aims to solve a problem of huge size, poor stability and high manufacture cost of a prior hydraulic vibration table. The turning device is characterized by comprising a transmission chain, a horizontal positioning block, a hydraulic motor, a hydraulic actuator, a horizontal slide table, an axle bed, a vertical positioning block, a pedestal, a turning shaft, a switching valve block and a balancing weight. According to the invention, by utilizing a regular servo actuator and a simple mechanical structure, turning in the horizontal direction and the vertical direction of the hydraulic actuator is realized quickly and conveniently and functions of implementing vibration tests in the horizontal direction and the vertical direction of the single actuator are achieved and the system manufacture cost is reduced substantially. At the same time, the turning device has a self-locking function, so that the hydraulic actuator can stop at any position. The turning device is accurate in positioning, simple and practical in operation and stable in performance.