The invention discloses an artificial heart. The artificial heart comprises a heart cavity, a disc-shaped diaphragm pump, a linear motor, an in vitro and vivo electric energy transmission conversion circuit, a microcomputer heart rate controller and a linear motor heat pipe cooling device; the microcomputer heart rate controller comprises a respiratory rate sensor, a clock frequency unit, a control chip and a control circuit which are in electric signal connection; the control chip is connected to the linear motor through the control circuit, so that the linear motor moves according to a corrected breath comprehensive frequency; the disc-shaped diaphragm pump, the linear motor and the linear motor heat pipe cooling device are all arranged in the heart cavity, and the outer surface of the heart cavity is covered with a layer of artificial connective tissue serosa. The artificial heart is convenient to operate, the disc-shaped diaphragm pump is utilized to replace a myocardium pump, the linear motor is adopted to drive a disc-shaped diaphragm at the same time, with respect to the linear motor, a complex intermediate mechanism needed for converting the rotation motion of a rotary motor into the linear motion can be omitted, the linear reciprocating motion is directly obtained, the structure is simple, and the effect is better.