A high-precision rice pot seedling-growing tray seeding device belongs to the agricultural machinery. A mould orifice plate and a fixed gear rack are fixed on a frame body of the device; a tray thruster and a seed box assembly are movably arranged on the frame body of the device; a bristle brush wheel and a gear wheel are fixedly arranged on a rotating shaft of the seed box assembly; the seed boxassembly is sheathed with a movable strutting piece in a rolling way; a rotating plate assembly used for sheathing, connecting and mounting a connecting plate is entirely set and arranged under the mould orifice plate; a motor and a transmission main shaft are fixedly arranged at the lower side of the frame body of the device; a rocker is articulated on the frame body of the device; the two ends of the rocker are respectively articulated with the connecting plate and a push rod; a crank, a cam and a driving wheel B are fixedly arranged on the transmission main shaft; a driving belt is sheathed on a driving wheel A and the driving wheel B of the motor; the two ends of a tray thruster connecting rod are articulated with the tray thruster and the crank; the cam and the push rod are contactedand matched with each other, and the two ends of a seed box assembly connecting rod are articulated with the tray thruster and the seed box assembly. The seeding device has the advantages of good operating quality, high precision, high operation efficiency, reliable operation and few failures.