The invention discloses a hydraulic simulator platform infinitely rotating around a Z-axis. The upper end of a static platform foundation is coaxially provided with an annular gear and an annular guide rail in sequence; the lower ends of slide blocks in six moving members are in sliding connection with the annular guide rail respectively; the upper end of the slide block in each moving member is connected with a slide block fixing plate; a hydraulic motor is mounted on the lower end of an L-shaped motor fixing plate at one side of the slide block fixing plate; an outer gear is sleeved on a transmission shaft and engaged with the annular gear; four corners at the lower side of the slide block fixing plate are respectively provided with pulleys laminated with the convex edges of the internal and external side surfaces of the annular guide rail; and the control wires of a control box mounted in the static platform foundation are connected with six servo motors respectively. The simulator platform infinitely rotates around the Z axis so as to avoid a washout filter algorithm around the rotation direction of the Z axis, thereby effectively improving the authenticity of simulation, effectively improving the strokes in X, Y and Z directions, especially the Z direction and greatly increasing the working space of the simulator.