The invention provides a hexagonal semi-submersible type tidal current energy and wind energy power generation platform which comprises a hexagonal platform structure and a main floating body. The hexagonal platform structure comprises a hexagonal frame. The six vertexes of the hexagonal frame sequentially comprise a first vertex, a second vertex, a third vertex, a fourth vertex, a fifth vertex and a sixth vertex in an anticlockwise mode. A first box beam, a second box beam and a third box beam are mounted between the six vertexes. A first variable cross-section floating barrel, a second variable cross-section floating barrel, a third variable cross-section floating barrel, a fourth variable cross-section floating barrel, a fifth variable cross-section floating barrel and a sixth variable cross-section floating barrel are mounted below the six vertexes respectively. The main floating body is arranged between the first variable cross-section floating barrel and the fourth variable cross-section floating barrel, a first stand column is arranged between the junction of the first box beam and the second box beam and the main floating body, and a second stand column is arranged between the junction of the first box beam and the third box beam and the main floating body. A first water turbine lifting device, a second water turbine lifting device and a third water turbine lifting device are mounted between the first box beam and the main floating body. According to the hexagonal semi-submersible type tidal current energy and wind energy power generation platform, the excellent stability can be guaranteed, and the sea keeping performance is greatly improved; in addition, water ballast spaces are arranged in the six floating barrels and can be used for adjusting the water volume inside so that the floating state of the platform can be guaranteed.