The invention discloses a low-carbon benefit analysis system for grid connection wind power generating. The low-carbon benefit analysis system comprises a basic data collecting module, a wind power generating income analyzing module, a wind power generating cost analyzing module, a grid loss improvement benefit analyzing module, a spare capacity cost analyzing module, a wind power generating low-carbon benefit analyzing module and a wind power generating carbon emission reimbursed time analyzing module. According to the low-carbon benefit analysis system, the low-carbon positive factor and the low-carbon negative factor of wind power generating are taken into consideration, carbon emission, emission reduction characters and economic benefits of a grid connection power generating system are analyzed in four aspects including the wind power generating income, the wind power generating cost, the grid loss improvement benefits and the spare capacity based on the full service life cycle idea, and the result can provide guidance for a new-energy power distribution network low-carbon plan.