The invention relates to a steering wheel parking return-to-center warning system. An infrared transmitter of the system is fixed at a position, deviated from the center, of the back of a steering wheel; an infrared receiver is fixed at the lower part of a center console; when the steering wheel is returned to the center, the position of the infrared receiver corresponds to that of the infrared transmitter; a gear detection switch and the infrared receiver are connected into the same circuit in series; a single-pole and double-throw switch relay is controlled to be triggered by an output end of the infrared receiver through a low-level signal; a warning device switch is composed of a movable contact piece and a normally open contact; the movable contact piece and a normally closed contact form a driver control switch; a timer, the warning device switch and an LED (Light Emitting Diode) warning lamp are connected in series to form a branched circuit and the branched circuit is connected with a branched circuit of the driver control switch in parallel; the parallel branched circuit and a resistor are connected into a power supply circuit of a power supply in series; and an output end of the timer is connected with a vehicle alarm communication device through a vehicle alarming switch. The steering wheel parking return-to-center warning system has the advantages of high detection accuracy, no interference on divers, relatively small changes of vehicles and low cost.