The embodiments of the present invention provide a panoramic sea view monitoring method, said method including: aligning any two adjacent monitoring cameras among a plurality of monitoring cameras, so that the any two adjacent monitoring cameras are located on the same physical horizontal plane in a field of view; obtaining monitoring images by using the plurality of aligned monitoring cameras and a depth-of-field camera to monitor a panoramic sea view; determining a horizontal spacing parameter and a vertical spacing parameter of the any two adjacent monitoring cameras; and using the horizontal spacing parameter and the vertical spacing parameter to combine the monitoring images in a pairwise manner, so as to construct a two-dimensional scene. The present invention also provides a panoramic sea view monitoring device, a server and a system. The present invention can reduce the complexity of the system while reducing the cost.