The invention discloses a tidal current energy water turbine multi-directional displacement single-pile type support foundation and an installation method. According to the technical scheme, the tidalcurrent energy water turbine multi-directional displacement single-pile type support foundation comprises a large-diameter single-pile foundation vertically penetrating into a seabed, the side wall of the single-pile foundation is provided with a plurality of horizontal annular slide ways surrounding a pile wall and vertical to a pile shaft and a plurality of vertical slide ways parallel to the pile shaft, the horizontal annular slide ways communicate with the vertical slide ways, the side wall of the single-pile foundation is provided with a plurality of side direction supporting arms, the side wall of the single-pile foundation can slide along the horizontal annular slide ways or the vertical slide ways, the side direction supporting arms can be fixed to the side wall of the single-pilefoundation, and each side direction supporting arm is connected with a plurality of tidal current energy water turbines. The foundation obtains multi-layer and multi-directional tidal current energyeconomically and efficiently, facilitates the adjustment of the tidal current energy water turbine orientation, increases the energy obtaining range of tidal current energy devices and can meet the tidal current energy obtaining needs of multi-directional and multi-tidal current energy waterway water areas.