The utility model relates to a boat outboard water inlet opening grating shield, which comprises a framework, wherein a silk screen is covered on the framework, the mesh size of the silk screen is 6 to 10mm, the framework is in a three-dimensional structure and consists of steel pipes with the diameter greater than 25mm, and the silk screen is formed by shearing a steel plate net. The boat outboard water inlet opening grating shield provided by the utility model has the advantages that a first barrier for the outboard water inlet is built, the blockage of an outboard water inlet opening per se can be prevented, and the ideal protection effect is realized on a whole cooling water system chain behind the outboard water inlet opening grating of a boat.