The invention discloses a method and device for realizing a karaoke function. The method comprises the following steps: a mobile terminal reads an accompany file and decodes the accompany file to obtain accompany data, receives voice data of other users in a chat room entered by the mobile terminal from a chat room server to obtain the accompany data and the voice data in real time, and carries out sound mixing on the accompany data and the voice data to obtain first sound mixing data and plays the first sound mixing data; and the mobile terminal carries out audio recording while playing is carried out and eliminates play sound of itself in the recorded voice data to obtain singing data, carries out sound mixing on the singing data and the accompany data to obtain second sound mixing data, and uploads the second sound mixing data to the chat room server. The method and device for realizing the karaoke function provide a real-time karaoke singing platform based on the mobile terminal for users, so that singers are allowed to interact with other users in the chat room in the process of singing a song with the mobile terminal.