Upper cover plate for tail door of vehicle, tail door and vehicle

The utility model relates to the technical field of vehicles, in particular to an upper cover plate for a tail door of a vehicle, the tail door and the vehicle, and aims to solve the problems that water is easily accumulated on an upper cover plate of a tail door of an existing vehicle due to a reinforcing structure, and the accumulated water flows out of the upper cover plate in the opening and upturning process of the tail door, so that the cost is low. And the car use experience of the customer is seriously influenced. Therefore, the upper cover plate is provided with the water outlet and the first water guide groove communicated with the water outlet, and the first water guide groove can guide water on the upper cover plate to the water outlet to be discharged, so that water accumulation on the upper cover plate is avoided. By means of the arrangement, when a vehicle rains or is washed, the upper cover plate of the tail door can drain water away in time through the first water guide groove and the water d