The utility model discloses a diesel generating set with a silencer for a data center. Including a base, a plurality of inserting holes are fixedly formed in the surface of the outer side of the base;wherein a fixed plate is fixedly mounted on one side of the upper end of the base; a diesel generator is fixedly mounted at one end of the fixed plate; an installation box is fixedly installed on theouter side of the diesel generator, a sound absorption layer is fixedly installed on the inner side of the installation box, a silencing layer is fixedly installed on the inner side of the sound absorption layer, a plurality of silencing holes are fixedly formed in the inner side of the silencing layer, threaded grooves are fixedly formed in the inner sides of the silencing holes, and a pluralityof connecting rods are fixedly arranged on the two sides of the upper end of the installation box. According to the utility model, the mounting box is fixedly mounted on the outer side of the dieselgenerating set; and the sound absorption layer and the silencing layer are arranged on the inner side of the mounting box, noise generated by the generator set can be eliminated through silencing holes in the inner side of the silencing layer, threaded grooves are formed in the inner sides of the silencing holes, and the silencing effect of the silencing layer can be improved.