Ship outboard cooler and ship cooling system

The invention relates to the technical field of ship outboard coolers and ship cooling systems, in particular to a ship outboard cooler which comprises a cooling tank and a high-temperature water tank, a water outlet pipe is fixedly connected to the high-temperature water tank, a water pump is fixedly connected to the cooling tank, and the water pump is fixedly connected with the water outlet pipe. A cooling water cavity is formed in the cooling box; a shell is fixedly connected to the interior of the cooling box, the shell is connected with the water pump through a communicating pipe, a mounting cavity is formed in the shell, an extrusion assembly is arranged in the mounting cavity, and the extrusion assembly comprises an electric telescopic rod fixedly mounted in the mounting cavity. According to the cooling device, fresh water can be cooled more thoroughly, subsequently cooled fresh water can fall into the cooling water cavity through the filter screen plate, heat source equipment continues to be cooled, a