A sowing machine includes a stirring mechanism and a material detecting mechanism. The material detecting mechanism includes a driven member, a magnetic member, and a Hall effect sensor. When not blocked by material in the sowing machine, the driven member is configured to rotate under a driving force of a rotating shaft of the stirring mechanism, and drive the magnetic member to rotate； and the Hall effect sensor is configured to detect a first signal corresponding to the magnetic member indicating material absence. When blocked by the material, the driven member is configured to stop rotating under a resistance of the material, and stop driving the magnetic member to rotate； and the Hall effect sensor is configured to detect a second signal corresponding to the magnetic member indicating material presence. Whether the material exists is determined based on the first or the second signal.
