The utility model relates to agricultural machinery, in particular to an electromechanical potato-supplying type potato combined seed and fertilizer drill which mainly comprises a belt, spoons, an opener, a potato-supplying box, a controller, a photoelectric sensor, a stepping motor, a vibration motor, a vibrational force adjusting plate, a gate, an outward rotating handle, an adjusting location plate and a rack, and is characterized in that the steel spoons are evenly installed on the hoisting belt; the curved surface of the spoon is made into a spinning paraboloid; the bottom of the potato-supplying box is provided with a hole over against a sowing pipe; the interior of the potato-supplying box is separated into a plurality of small grids by clapboards; the sensor is installed at the upper part of a potato-sowing device and is at the same vertical plane with the hoisting side of the spoon; the opener is stair-stepping, the interior of the opener is welded with a fertilizer-guiding plate, and the tail end of the second step of the opener is welded with a scraping plate; and a seed-guiding pipe is made into a U-shaped groove, the upper end of the seed-guiding pipe is aligned with the hole in the bottom of the potato-supplying box, and the U-shaped opening of the seed-guiding pipe is over against the spoon on the hoisting belt. The combined seed and fertilizer drill can meet the seeding requirements of different row spacing through changing the transmission ratio between a land axle and a driving shaft of the potato-sowing device. The combined seed and fertilizer drill adopts the electromechanical potato-supplying device to solve the defect of missing seeding in the practical seeding process, and adopts a vibration device matched with the spoons with special curved surfaces to eliminate reseeding; and the scraping plate at the tail end of the opener ensures the seeding depth to be consistent, and steps can ensure the seed manure to have certain interlayers.