The invention discloses a multi-camera live method and system. The method comprises the following steps: S1, fixing at least two depth camera positions in a live scene, acquiring and storing a background depth value of each live scene through each depth camera; S2, acquiring the current position depth image of an anchor through the depth camera, generating an optimal depth camera serial number according to the depth image, and switching the live picture to the camera picture; S3, detecting whether the anchor position is changed through the depth camera, and repeating the step S2 when the anchor position is changed. The system comprises a storage module, a camera group, and a processor; the camera group comprises at least two depth cameras; the storage module is used for storing the background depth value of each live scene; a live scene processor is used for the optimal camera serial number. By use of the method disclosed by the invention, the switching of the optimal camera is automatically realized, and the smoothness of the live process can be maintained in various interaction processes of the network anchor and the audience.