The invention relates to a plate conveyor. The plate conveyor comprises a rack, a chain transmission mechanism and a conveying chain plate unit, wherein guide rails are arranged on two sides of the rack; wear-resisting sliding plates are arranged on the rack; the conveying chain plate unit comprises a plurality of rubber plates, a plurality of support plates, a plurality of connecting press plates and a plurality of blocking side plates, lower ends of the rubber plates are fixedly connected with the support plates, the support plates are connected with a roller chain, mobile auxiliary support devices are arranged at the lower ends of the support plates, the support plates comprise first support plates and second support plates, each first support plate is located at the lower end of the butted position of every two adjacent rubber plates, the corresponding connecting press plate is arranged at the upper end of the butted position, the blocking side plates comprise inner blocking side plates and outer blocking side plates, and each outer blocking side plate and the two adjacent inner blocking side plates are staggered and overlapped to form clearance fit. According to the plate conveyor, the conveying chain plate unit can be prevented from being worn and damaged, garbage leaking and falling during transportation of garbage can be reduced, corrosion resistance of the plate conveyor is improved, and the residual garbage is more convenient to clean.