The invention relates to a closed-loop transcranial magnetoacoustic stimulation device, which comprises a computer, a signal generator, a power amplifier, a focused ultrasonic transducer, a microfilament electrode array, a differential amplifier, a signal acquisition card and magnets, and is characterized in that the computer is communicated and connected with the signal generator through a data line, the output end of the signal generator is connected with the input end of the power amplifier through a data line, the output end of the power amplifier is connected with a signal input end of the ultrasonic transducer through a data line, the input end of the microfilament electrode array acquires cranial nerve electric signals, the output end of the microfilament electrode array is connected with the input end of the differential amplifier through a data line, the output end of the differential amplifier is connected with an A / D interface of the input end of the signal acquisition card through a data line, and the output end of the signal acquisition card is connected with the computer through a data line. A test sample is placed below the ultrasonic transducer, and two sides of the test sample are provided with the magnets respectively. The closed-loop transcranial magnetoacoustic stimulation device has the characteristics of high spatial resolution, convenient operation, accurate stimulation, no damage and the like.