The invention belongs to the field of new energy, and particularly relates to a wind power generation system and a working method thereof. The wind power generation system comprises a cloud server anda plurality of wind power generation devices. The wind power generating devices comprise control modules, impellers and infrared athermalization camera devices. The infrared athermalization camera devices are suitable for shooting working pictures of the impellers and sending the working pictures to the control modules, and the control modules are suitable for sending the working pictures to thecloud server. The wind power generation system shoots the working pictures of the impellers through the infrared athermalization camera devices and sends the working pictures to the cloud server, theinfrared athermalization camera devices monitor the impellers day and night so as to find the idle impellers in time, and the production efficiency of the wind power generation system is improved.