The invention discloses a curved plate grid of a lead-acid storage battery. The curved plate grid comprises a frame, a plurality of ribs arranged inside the frame and a lug arranged on the frame, wherein the frame comprises longitudinal frames and transverse frames, and the ribs comprise longitudinal ribs and transverse ribs; the longitudinal ribs and the transverse ribs are interwoven into a rib net; the longitudinal frames and the longitudinal ribs or transverse ribs are of a continuous curve shape with obvious crests and troughs; the transverse ribs are of a straight line, and are positioned between the adjacent crests and troughs of the longitudinal ribs; an included angle is formed between the upper surfaces or lower surfaces of the transverse ribs and a plane of the grid. Compared with an existing grid, the curved plate grid has the advantage that the coating thickness of an active material is greatly increased on the basis that the existing grid and the curved plate grid are equal in weight, so that the full-filling quantity of the active material is increased, and the specific energy of the lead-acid storage battery is increased; the bonding strength between the active material and the grid can be greatly enhanced, the active material is favorably prevented from falling off, and thus the service life of the lead-acid storage battery is prolonged.