Unit curtain wall windowsill board system adapting to multi-angle changes

The invention relates to a unit curtain wall windowsill board system adapting to multi-angle changes, and belongs to the field of curtain walls. The system comprises a front-end rotating support connected with a cross beam and a windowsill plate body correspondingly and rotationally connected with the front-end rotating support. A rotary groove I is arranged in the front-end rotary support; the windowsill board body is of a right-angle L-shaped structure, a round head rotating shaft I is arranged at one end of the windowsill board body, a supporting end face is arranged at the other end of thewindowsill board body, the round head rotating shaft I is correspondingly embedded into the rotating groove I in the front-end rotating support in a clamped mode, and the round head rotating shaft Ican deflect in the rotating groove I to enable the windowsill board body to be in a horizontal state. According to the system, multiple changing angles can be achieved through a small number of sectional material molds, comple