Image splicing method and device and readable storage medium

The invention discloses an image splicing method and device and a readable storage medium, and the method comprises the steps: obtaining multiple paths of source image video streams; determining a preset first position information set of each source image block in each path of source image video stream in the multi-path source image video stream, and storing the first position information set into an external memory, one position information being used for indicating a coordinate position of one source image block in the corresponding path of source image video stream; reading the first position information set from the external memory and storing the first position information set in a local memory before splicing all source image blocks in a first path of source image video stream in the multi-path of source image video stream; and based on the first position information set, determining a second position information set of each source image block in the first path of source image video stream in the local