The utility model belongs to an agricultural production machine, and particularly relates to a single-driving-wheel seeder. The front end head of a wheel axle frame (4) is fixedly connected with the left end of a seed-metering device (16) by using a bolt, the right end of the seed-metering device (16) is fixedly connected with a four-bar mechanism (12), the outer side of a hinge shaft at the lower left side of the four-bar mechanism (12) is hinged with the lower end of a limiting plate (9), the front and rear sides of the side face at the upper end of the limiting plate (9) are provided with a working hook groove (9-1) and a travelling hook groove (9-2), a U-shaped clamp (13) is arranged on a connecting rod at the lower right side of the four-bar mechanism (12), a ditcher mounting seat (25) is fixedly arranged below the front side of the seed-metering device (16), a driving wheel main-shaft (3) is mounted behind the wheel axle frame (4), and a driving wheel is arranged on the driving wheel main-shaft (3) in the wheel axle frame (4). The single-driving-wheel seeder is simple in structure, small in size, light in weight, and easy to move and carry; and the seeder can be used for sowing peanuts, corn and beans plants, therefore, the seeder is wide in application scope, good in press effect, and high in emergence rate.