The invention relates to a moving object detecting device based on a microwave transducer and an ultrasonic transducer. The moving object detecting device comprises a low-power dissipation microcontroller unit, the microwave transducer, the ultrasonic transducer, a signal amplifying and filtering processing circuit, a field bus interface unit, a temperature transducer and a power source unit. The microwave detecting technology and the ultrasonic detecting technology are combined. The detecting distance of the microwave transducer is far, the response speed is high, the anti-jamming capability is high, the measuring precision of the ultrasonic measurement is high, and the angle range is small. When the microwave transducer detects that a moving object passes a detecting area, the ultrasonic transducer is started immediately to confirm that the object enters the detecting area, and the distance and speed information can be obtained. The moving object detecting device is compact in structure and capable of dealing with different environments and detecting the low-speed moving object, the problems that an existing detecting technology based on a pressure transducer, a pyroelectric infrared transducer and visual patterns is large in error, poor in anti-jamming capability and the like are well solved, and the problems that installation and construction are difficult are solved. The moving object detecting device has the advantages of being small in size, high in response speed and low in power consumption.