The invention relates to a kneader machine (10) for alimentary doughs comprising a container (20) provided with a tight lid (70) and a rotor (30) rotatably arranged in said container (20) about a vertical rotation axis (A), wherein said rotor (30) comprises a flat base consisting of a plurality of arms (32, 33) and a plurality of mixing paddles which extend from said arms (32, 33) in a vertical direction (V), and wherein the arms (32, 33) of the rotor (30) comprise bevelled surfaces (34) formed along their peripheries on the sides intended to face a rotation direction of rotation (R) of the rotor (30). The mixing paddles comprise first and second mixing paddles (35, 36) configured so as to generate between them a whirling motion of the particles of the solid ingredients on a plane (P) passing through the rotation axis (A) of the rotor (30) and perpendicular to its base. Thanks to these features it is possible to generate on planes that are mutually perpendicular whirling mixing movements, which promote the contact between the particles of the solid ingredients of an alimentary dough and the liquid ingredients necessary to its preparation that are injected into the container, thus allowing to maximize the hydration level of the solid ingredients and to minimize the preparation time of the dough. The invention also relates to a method of making an alimentary dough by using said kneader machine.