The present invention discloses a high-speed seeder, which comprises a rack assembly, a seeding box, a seeding monomer rack, a round disc ditching device, a sliding cutter ditching device, a soil covering device and a pressing depth limiting wheel, wherein the seeding monomer rack is connected to the rack assembly, the seeding box is arranged on the seeding monomer rack, the round disc ditching device, the sliding cutter ditching device, the soil covering device and the pressing depth limiting wheel are sequentially arranged on the seeding monomer rack from front to rear, a seeding mechanism is arranged in the seeding box, and comprises a diversion plate, seeding wheels and a seeding shaft, the seeding shaft penetrates through a pair of the side walls of the seeding box, the diversion plate is arranged between the two side walls of the seeding box, and is positioned below the side of the seeding shaft, a seeding flow channel is reserved between the diversion plate and the seeding shaft, both ends of the seeding shaft are provided with the seeding wheels, and the seeding wheels are connected to the round disc ditching device through a chain. According to the present invention, the seeding is performed with the seeding mechanism, such that the seeding effect is good, the ditching depth is stable, the seeding quality is high, and the high-speed seeder is suitable for the basic situation of the vast rural areas of our country.