The invention relates to a small field sower, which comprises a frame, and a seed supply device, a seed dropping device, a seed dropping control device and a ditching and covering device which are positioned on the frame. The rear of the frame is provided with a seed supply operating platform; one side of the seed supply operating platform is provided with the seed supply device, while the other side is provided with a seed dropping control operating platform; the front of the seed supply operating platform is provided with the seed dropping device; the ditching and covering device is arranged under the frame; and the seed dropping device is connected with the ditching and covering device through a grain tube. The small field sower eliminates instability of power supply of a ground wheel in mechanical seed dropping, reduces power loss caused by a plurality of mechanical transmission links, improves mechanical transmission efficiency, adopts motor control to replace the conventional mechanical control mode, has a simple structure, improves the sowing accuracy due to constant power output, greatly reduces adverse effect caused by a seed dropping control transmission system, improvesthe accuracy, scientificity and universality of small field contrast test study, and meets the current development requirement of small field sowers in China.