A magnetic transistor circuit with the AND, NAND, NOR and OR functions has a first, a second, a third, a fourth magnetic transistor, and a routing line. These four magnetic transistors as ordinary transistors that can be turned on or turned off by the control of several metal devices respectively disposed around the magnetic transistors. The AND, NAND, NOR and OR logic functions of the binary system can be implemented by the control of these metal devices.