The invention discloses a concrete mixer. The concrete mixer includes a material stirring
barrel, a first motor, a first stirring shaft, a first stirring
paddle, a second stirring
paddle, stirring vanes, a second motor, a second stirring shaft, a third stirring
paddle, a feeding port, a feeding port cover, a
discharge port, a
discharge port cover and a base. The first motor is electrically connected with a controller, the second motor is electrically connected with the controller, and starting of the motors and the rotation speed of the stirring shafts driven by the motors are controlled by the controller. According to the concrete mixer, by adopting a dual-drive stirring mode in which the stirring direction is opposite, and combining with structural design of the stirring paddles,
convection of materials is formed during stirring, correspondingly the materials are fully stirred, and the stirring efficiency is improved. Meanwhile, through the structural design of the stirring vanes, the
convection of the materials can be enhanced, materials bonded to the wall of the material stirring
barrel can be scrapped off at the same time, and complete stirring is facilitated.