The invention discloses a waterproof grille of a pure electric bus, and belongs to waterproof grilles. The waterproof grille comprises two transverse frames, two vertical frames and a waterproof grille body, wherein the two transverse frames and the two vertical frames form a rectangular window frame; the waterproof grille body is uniformly fixed between the two vertical frames from the upper part to the lower part; the waterproof grille body is inclined outwards; the top end of the waterproof grille body is connected with a vertical upward extending part; the bottom end of the waterproof grille body is connected with a vertically downward extending part; a vertical water retaining brush is arranged at the upper part of the bottom of the waterproof grille body; the bottom end of the downward extending part is connected with a second baffle parallel with the waterproof grille body; water leakage through holes are uniformly formed in the second baffle. The waterproof grille is reasonable in structural design, simple in manufacture technology and low in cost, guarantees a good ventilation effect on the basis that water from all directions cannot penetrate through the whole grille, and effectively guarantees the heat dissipation and waterproof functions of batteries in a luggage compartment.