The invention discloses a wind-solar complementary system bottom mud in-situ aeration device and method and belongs to the field of water bottom material treatment. The device comprises a wind-solar complementary power supply system and a microporous aeration system. The wind-solar complementary power supply system comprises an inverter. The microporous aeration system comprises an air blower and a microporous aeration plate. The output of the inverter is connected with the air blower, and the air blower is connected with the microporous aeration plate. The wind-solar complementary system bottom mud in-situ aeration device and method aim to overcome the defects that existing aeration is mainly applied to riverway or lake water, the capacity of oxygen to permeate bottom mud is limited, and the black and odorous bottom mud anaerobic environment cannot be directly and effectively improved. Aeration is directly conducted through bottom mud; oxygen is directly permeated into the bottom mud without causing intensive disturbance of the bottom mud; the bottom mud anaerobic environment is effectively improved; aeration is driven through the natural energy wind-solar complementary system; the problem that in the wild, it is inconvenient to supply electric power is solved; energy consumption is saved. The wind-solar complementary system bottom mud in-situ aeration device is simple in structural principle, low in production cost and easy to implement and has high environmental benefits and economic benefits.