The invention discloses a soil covering device for seeders. The soil covering device includes a seeding bracket, a connecting rod and a soil covering roller. One end of the connecting rod is hinged to the seeding bracket, and the other end is in pin connection with a scraping support rod. The middle part of the connecting rod is bent, and the bent part is fixedly connected to adjustment screws, the tops of the adjustment screws are fixed to the seeding bracket through nuts, the middle parts of the adjustment screws are provided with adjustment nuts, and springs are arranged between the adjustment nuts and the seeding bracket. A scraping plate is rotatably connected to the scraping support rod. The connecting rod is equipped with bearing seats, and the two bearing seats are connected by the soil covering roller. According to the invention, the adjustment screws and the adjustment nuts can adjust the height of the connecting rod, and further can adjust the height of the soil covering roller, thereby controlling the soil covering amount. And the scraping plate can effectively remove soil blocks and stubble mixed in the soil covering roller, thus improving working efficiency and reducing use cost.