The present invention relates to a tractor-attachable soybean seeder. According to the present invention, since soil preparation is performed while spreading soil, which is generated by deeply digging a furrow with a rotary blade (120), on a ridge, so that a drainage effect is increased in a paddy. A ridge forming plate (160) and a furrow forming blade (150) are attached to the rear part of the rotary blade (120) in a tunnel type to be able to adjust the height thereof, such that a shoulder portion of the ridge is pressed to prevent a collapse, and to prevent loss of the ridge. Moreover, the entire front and side surfaces are covered with scattering prevention covers (130, 140, 142) to prevent soil from being outwardly scattered during rotation of the rotary blade (120), and a chemical sprayer (400) is installed therein to perform pest control simultaneously with seeding.본 발명은 트랙터 부착형 콩 파종기에 관한 것으로, 로터리날(120)에 의해 골을 깊게 파낸 흙을 두둑 위에 뿌려주면서 정지(整地)작업을 함으로써 논의 물빠짐효과를 향상시키고, 로터리날(120) 후부에 골 성형날(150)과 터널형으로 두둑 성형판(160)을 높낮이 조절가능하게 부착하여 두둑의 어깨부분이 무너지지 않도록 눌러주어 두둑의 유실을 방지하며, 로터리날(120)의 회전시 흙이 외부로 비산되지 않도록 전면 및 측면 전체를 비산방지용 커버(130,140,142)로 씌우고, 파종과 동시에 방제를 실시할 수 있도록 약제 살포기(400)를 설치한 것이다.