The utility model relates to a seedling erecting mechanism of a carrot harvester. The seedling erecting mechanism comprises seedling separation shovel tips, a right rotating seedling separation roller, a middle seedling separation roller, a left rotating seedling separation roller, hydraulic motors and a fixing machine frame. The right rotating seedling separation roller, the middle seedling separation roller and the left rotating seedling separation roller are arranged side by side, the front end of the right rotating seedling separation roller, the front end of the middle seedling separation roller and the front end of the left rotating seedling separation roller are each connected with one seedling separation shovel tip, the front end of the right rotating seedling separation roller and the front end of the left rotating seedling separation roller are connected with the corresponding seedling separation shovel tips in a rotating mode, and the front end of the middle seedling separation roller is connected with the corresponding seedling separation shovel tip in a fixed mode. The rear end of the right rotating seedling separation roller and the rear end of the left rotating seedling separation roller are fixedly connected with the power output ends of the hydraulic motors. Under the seedling erecting action of the right rotating seedling separation roller, the middle seedling separation roller and the left rotating seedling separation roller, lodging carrot seedlings can be erected and smoothly clamped by a clamping mechanism arranged behind the seedling erecting mechanism. By the adoption of the seedling erecting mechanism, the total erecting rate of the carrot combine harvester can be greatly increased.