The invention discloses a semiautomatic device for selecting and sowing seeds of peanuts. The semiautomatic device comprises a seed selection box, an inserting plate, a motor, an outer box body, a crank rocker mechanism, a vibration sieve, a flow divider, a seed distribution mechanism, a travelling wheel, a slotting mechanism and an earthing mechanism, wherein the inserting plate is used for controlling the flowing-out amount of the peanuts of the seed selection box; the motor is used for driving the vibration sieve to vibrate back and forth through the crank rocker mechanism to finish semiautomatic seed selection of the device; waist-shaped holes and stopping pins, which are randomly and crossly arranged, are designed on the vibration sieve; the flow divider is connected with the vibration sieve and the seed distribution mechanism; a seed distribution inner groove is designed on a seed distribution disc; the slotting mechanism is used for realizing slotting and soil turning; the seed distribution mechanism is used for sowing the peanut seeds into a soil turning slot of the slotting mechanism; the earthing mechanism is used for realizing soil turning recovery and finishing semiautomatic seed sowing of the device; the travelling wheel, a seed distribution rod and the seed distribution disc share one drive and soil turning and slotting, peanut seed sowing and the soil turning recovery are carried out synchronously. The semiautomatic device is simple in structure, flexible to operate and low in manufacturing cost; the automation degree of a comprehensive function of selecting the seeds of the peanuts and sowing the seeds is improved.