A dough mixing and kneading machine wherein a horizontal drum has a sealable inlet opening at the top and a sealable outlet opening at the bottom. One end wall of the drum is pivotable to and from an open position and carries an L-shaped tool which sweeps along its inner side and along the internal surface of the cylindrical main section of the drum when the machine is in use. The tool is coaxial with the main section of the drum and is driven by a motor which is mounted at the outer side of the pivotable end wall. A second motor drives a shaft which extends into the drum below the axis of the main section and carries several angularly offset propellers which move the constituents of dough axially and radially of the main section.