The invention relates to a point sound source positioning system intelligent detecting front-end based on a semispherical microphone array. The point sound source positioning system intelligent detecting front-end based on the semispherical microphone array comprises an STM32 processor, a sound source detecting unit, signal conditioning circuits and a data transmission module. Microphones in the sound source detecting unit are connected with corresponding signal conditioning circuits. Each signal conditioning circuit is powered by a single lithium battery in a centralized manner. Each signal conditioning circuit is connected with the STM32 processor. The STM32 processor is connected with a data transmission module. The semispherical microphone array is utilized in the sound source detecting unit. The directions of microphones on each layer of the semispherical surface are arranged in a direction of a normal line between a sphere center and the point. The point sound source positioning system intelligent detecting front-end aims at the point sound source and acquires noise information in different angles and different directions in a synchronous real-time multipoint manner. Furthermore synchronous normalization processing is performed on multipoint information. Noise resolution reaches 0.1dB.