The invention provides a sound frequency collection device. The sound frequency collection device comprises a direct current voltage-stabilizing power source, a sound frequency amplifier module, a negative voltage module, an operation and amplification comparator module, a triode module, a digital potentiometer module, an MCU (microprogrammed control unit) microprocessor and a UART (universal asynchronous receiver/transmitter) communication interface module. The sound frequency collection device has the advantages that the sound frequency testing result of the equipment requiring sound frequency testing is obtained by the similarity between the sound frequency testing waveform sent by the equipment requiring sound frequency testing and the sound frequency testing waveform received by an MIC (microphone); by adopting a digitalized sound frequency testing module, the whole testing process is automatically completed; an operator can configure and adjust related testing parameters to meetthe testing requirements of different sound frequency equipment; the circuit cost is low, the property is stable, the testing result is objective and accurate, and the sound frequency collection device can be applied to different sound frequency detection occasions.