The embodiment of the invention discloses an audio data processing method, apparatus, terminal and system. The audio data processing method includes the steps: acquiring the audio data after space filtering; performing first Wiener filtering and second Wiener filtering on the audio data to obtain the first filtering data and the second filtering data, wherein the noise suppression degree of the first Wiener filtering is greater than the noise suppression degree of the second Wiener filtering; and utilizing the first filtering data to perform stop determination on the second filtering data, andaccording to the stop determination result, performing data processing on the second filtering data. The audio data processing method can respectively perform different degree of Wiener filtering according to different demand for voice activity detection and automatic voice recognition, can guarantee the accuracy of automatic voice recognition, can avoid the influence of interference on voice activity detection, can more accurately detect the voice activity state, can reduce the feedback time delay of voice interaction, can improve the response speed for the voice command, and can bring better use experience for the user.