The invention relates to a fully-automatic transplanting machine. The fully-automatic transplanting machine is composed of an independent rice-seedling tray frame, a frame, a transmission system, a storage device, a seedling uprighting plate, a ridging mechanism, a conveyor belt, an overturning mechanism, a power and control system and a sensor and execution mechanism. According to the invention, a motor is adopted to control the overturning form of a rice-seedling tray, and two rows of rice seedlings are automatically transplanted at the same time; a plurality of rice-seedling trays are placed in the independent rice-seedling tray frame and can be independently replaced; the transmission belt transmits the rice seedlings to a seedling uprighting mechanism, and the rice-seedling trays exit and enter a storage box at the same time; a tractor is utilized to pull and input powder, and the functions of seedling planting and ridging are obtained at the same time, so automatic control in the whole process is realized; the uniformity of seedling planting distances is guaranteed when the speed of pulling changes; and the fully-automatic transplanting machine provided by the invention has the advantages of unique structure, simple constitution, convenient production, assembly and maintenance, light weight, reliable work, convenient operation, large seedling loading capacity and high efficiency, can be used for transplanting of a plurality of crops, can correspondingly adjust a size according to different row distances, can meet popularization and application of an industrialized carrier-free seedling-raising technology, and promotes intensive and large-scale production.