Soybean precision seeding device with adjustable planting spacing

The invention belongs to the technical field of agricultural machinery, and particularly relates to a planting-spacing-adjustable soybean precision seeding device which comprises a mounting frame, an adjusting lifter is arranged on the mounting frame and is in transmission connection with an adjusting cam, a seeding mechanism is arranged at the bottom end of the adjusting lifter, and adjustable limiting mechanisms are fixedly connected to the two ends of the mounting frame. The adjustable limiting mechanism is matched with the seeding mechanism; the sowing mechanism comprises two hole sowing wheels, each hole sowing wheel comprises a hole sowing idler wheel, the hole sowing idler wheels are fixedly installed on an adjustable wheel shaft, the inner sides of the hole sowing wheels are coaxially and rotationally connected with end covers, the end covers are inserted into fixed round pipes through positioning rods on the end covers to be connected with adjusting lifters, and a plurality of positioning grooves are