The invention discloses a plate conveying mechanism for a double-layer curing kiln. The plate conveying mechanism comprises a curing vehicle for containing plates, a shuttle bus and a linear track, wherein the shuttle bus contains the curing vehicle, moves along a kiln outer conveying track and drives the plates to enter different stations, and the linear track is arranged in the double-layer curing kiln and connected with a front kiln door and a rear kiln door of the curing kiln. The curing vehicle moves along the linear track. The shuttle bus is provided with a pair of loading and unloadingdevice for pulling in and pushing out the curing vehicle. The loading and unloading device comprises a device body, a protrusion arranged on the device body and clamped with the curing vehicle, a longitudinal guide rail for limiting the motion direction of the device body, and a drive mechanism for driving the device body to move along the longitudinal guide rail in a reciprocating manner to pullin or push out the curing vehicle. According to the plate conveying device, by transferring the plates between the curing vehicle in the curing kiln and the shuttle bus outside the curing kiln, the plates can automatically enter the curing kiln or can be automatically pushed out of the curing kiln.