The invention discloses a storage method system based on time domain video fusion. The storage method based on the time domain video fusion comprises the following steps that a source video is obtained and detected; when interesting information is detected, pixel information of an interesting area is extracted, and the pixel information of the interesting area, the coordinate information of the interesting area and the extracting time information are sent to a server; and the server carries out synthesis processing on the pixel information according to the coordinate information of the interesting area and the extracting time information, and fuses the synthetic information to corresponding background video frames, and a processed video is formed and stored. By means of the storage method and system based on the time domain video fusion, the system capacity of the server can be increased, and the utilization rate of the storage space is improved.