A fuel-saving and energy-saving car controller includes a power supercharge control box (51) electrically connected with a direct-current brushless motor (41) of a power supercharger (40). The power supercharge control box includes a communication module which reads data in the on-board diagnostics (8) and the car computer (7) so as to detect a rotation speed of the engine (20). Thus, the communication module transmits a signal to the single-chip control circuit (1) which drives the motor actuating circuit (42) which controls the direct-current brushless motor to regulate a rotation speed of the air inlet fan (44).
