The present invention discloses a sound pickup device, a pet training monitor and a training monitoring method thereof. The sound pickup device comprises a single chip microcomputer, a digital silicon microphone, a wireless module and a power supply, wherein the single chip microcomputer is provided with a power supply interface and an SPI communication interface simulating a communication interface of the digital silicon microphone, and the SPI communication interface is connected with a clock pin and a data pin of the digital silicon microphone to collect single-channel audio data of the digital silicon microphone; the single-channel audio data is converted into PCM audio data by the single chip microcomputer, the single chip microcomputer is connected with an communication interface of the wireless module to transmit the PCM audio data, and an output end of the power supply is connected with the power interface of the single chip microcomputer to supply power to the single chip microcomputer. In this way, the sound pickup device, the pet training monitor and the training monitoring method thereof provided by the present invention have the characteristics of low cost, low energy consumption, small volume and the like, and can realize the functions of real-time voice and conditioned reflex training for a pet, thereby greatly expanding the management means of breeders for a pet.