The invention relates to a vertical shaft wind power generating system which can effectively prevent a rugged strong wind environment from damaging a system, effectively utilizes wind power and runs more safely and stably. The wind power is utilized to directly drive a main wind wing of the vertical shaft wind power generating system, and a main cantilever, a main cantilever fixed hub and a main shaft are utilized to drive a generator to generate electric power; whereas, when the rugged strong wind environment comes, the front face area of the main wind wing is regulated through the modes of changing the vertical opening angle of the main wind wing, expanding and contracting, folding and distorting the main wind wing, regulating the opening angle of a shutter-shaped blade and the like so as to effectively prevent the strong wind from damaging the system, and nay, a strong wind early warning system is particularly arranged, when that the strong wind exceeding warning wind speed value attacks is detected, the strong wind early warning system can send an instruction to the system in advance so as to take a strong wind avoiding measure, thereby greatly improving the running state and the safety of the wind power generating system.