The utility model relates to a panel turning gear assembly which is arranged on the load bearing rack of a server cabinet, and used for fixing and rotating a panel on a specific position when the panel is pulled out with a section of distance. The utility model comprises a panel, two fixed bodies, two slide boards and two rotary bodies. The panel has a bottom surface, a fixed part is respectively extended out from the two ends of the bottom surface, and the fixed part is provided with a rotary hole. The fixed bodies are symmetrically fixed on the load bearing rack. The slide boards symmetrically slide in the fixed bodies, and a rotary hole is arranged on the lateral side of the slide board. The rotary body has a bottom surface, a first lateral arm is extended out along the two sides of the bottom surface, a second lateral arm is extended out along the first lateral arm, and the first lateral arm and the second lateral arm are respectively provided with a first rotary shaft and a second rotary shaft, wherein the first rotary shaft and the second rotary shaft of the rotary shaft can respectively rotate around the shaft hole of the panel and the shaft hole of the slide board to realize perpendicular between the front side of the panel and the horizontal direction.