The utility model discloses a marine wind power direct current assembles power transmission system, including multiunit aerogenerator, AC -DC rectifier and DC -DC topological structure, submarine cable and DC -AC contravariant structure, wherein, every aerogenerator connects a AC -DC rectifier, aerogenerator is wind energy conversion the electric energy of three -phase AC form, the electric energy turns into the direct current ability through the AC -DC rectifier, a DC -DC topological structure is connected to a plurality of AC -DC rectifiers, collect the direct current booster stations with the fan energy through the direct current, step up through the DC -DC converter, DC -DC topological structure is through the extra large cable of sharing transmission to land, be incorporated into the power networks through DC -AC contravariant structure. The utility model discloses can reduce the cost of transportation and the installation degree of difficulty, still reduce system loss, improve the energy utilization of system.