The invention discloses an agricultural uniform sowing device, which comprises a mounting plate. A barrel penetrates through the left end of the mounting plate. A No.1 piston block and a No.2 piston block are slidingly arranged inside the barrel. The No.1 piston block and the No.2 piston block are fixedly connected through a drive spring, which has the effect of buffering the downforce to help prolong service life of the device. A drive screw is vertically arranged at the middle position of the lower end of the No.2 piston block. The lower end of the drive screw penetrates through a nut block,which cooperates with the drive screw. A rolling bearing is arranged at the outer side of the nut block. Two ends of the rolling bearing are fixedly connected with the internal wall of the barrel through a locating rod. The device has a simple and reasonable structure, requires no electric drive, is used to effectively realize uniform sowing of seeds, and also can help uniformly mix seeds in a material loading chamber and a fertilizer so as to effectively enhance the sowing effect of the device, and has strong practicality.