Video stream data switching method and device, terminal and readable storage medium

The invention discloses a video stream data switching method and device, a terminal and a storage medium. The method comprises the following steps of: in a process of transmitting first video stream data to a client, identifying a first transmission condition of the client; if the code rate of the first video stream data is not matched with the first transmission condition, obtaining second videostream data corresponding to the code rate matched with the first transmission condition, switching to transmit the second video stream data so as to automatically switch different code rates according to the transmission condition. When the transmission condition is better, the video stream data with higher code rate is transmitted to the client, the picture quality of the video is relatively good, therefore, a better watching effect is provided when the transmission condition is good; and when the transmission condition is poor, the conditions such as transmission of video stream data with asmall code rate to the cl