The invention belongs to the technical field of additive manufacturing, and discloses an additive manufacturing device and method. The additive manufacturing device includes a screw extrusion mechanism, wherein a first feed cylinder is internally provided with a melt feed inlet, and a first insulating layer is circumferentially arranged on the outer portion of the first feed cylinder; a second insulating layer is circumferentially arranged on the outer portion of the second feed cylinder; a screw is located in the first feed cylinder and the second feed cylinder, blades are arranged on the circumference, located in the first feed cylinder, of the screw, and a thread is arranged on the circumference, located in the second feed cylinder, of the screw; and the volume of the first feed cylinder is larger than the volume of the second feed cylinder, the diameter of the blades is larger than the diameter of the thread, and a torque sensor is connected to the top of the screw. The additive manufacturing device performs thermal insulation on a melt or semi-solid slurry and characterizes the viscosity state and flow state of semisolid through the torque sensor, so that the problem that theflow behavior of the semisolid cannot be effectively controlled in the prior art is solved.