The embodiment of the invention provides an audio transmission method, a client and a terminal device. The method includes the steps that when the client detects an audio transmission request, a recording application of the terminal device where the client is located is called for recording an audio file; the client collects audio frame data of the currently recorded audio file from the recording application of the terminal device; the client encodes the audio frame data of the currently recorded audio file and transmits the encoded audio frame data to a server. By means of the audio transmission method, the client and the terminal device, audio transmission efficiency can be effectively improved, and actual requirements of a user for audio transmission delay can be met.