The present invention refers to a self-propelled sowing machine (1), steered by a user standing on the ground, comprising a frame (2) to which are connected at least one front wheel (3A) and at least one rear wheel (3B) that allow its movement in the direction of travel (A) controlled through manoeuvring means (5), and a pneumatic precision seeding device (50) mounted on the frame (2) and comprising a rotating perforated disk interposed between a seed container (11) and a case (12) defining a suction chamber, and cooperating on one hand with an air suction device (20) and on the other with a selector suitable to select individual seeds that are released into at least one discharge chute (8) for laying the seeds on the ground. The sowing machine includes a single drive means (4) fastened on said frame (2) that transfers the movement to said at least one front wheel (3A) through a first transmission unit (14) and to the air suction device (20) through a second transmission unit (24) separate from said first transmission unit (14).
