C-column waterproof component of rear side door

The invention discloses a C-column waterproof component of a rear side door. Window frame reinforcing plates are arranged between triangular trim plates and glass sealing strips as well as between theinner plate of the rear side door and the outer plate of the rear side door, glass final assembly guide rails are arranged at the front sides of the window frame reinforcing plates and fixedly connected with the window frame reinforcing plates, the glass sealing strips are fixed in the guide grooves of the glass final assembly guide rail in an embedding manner, the triangular trim plates are fixedly arranged on the window frame reinforcing plates, the inner surfaces at the front parts of the triangular trim plates abut against the outer side walls of the glass final assembly guide rails, thefirst sides of the triangular trim plates are in sealing contact with the front side of the outer plate of the rear side door, the second sides of the triangular trim plates are in sealing contact with the outer sides extendin