A sidewall planing boat includes: a body; sub-bodies; and a power device; wherein the two sub-bodies are mounted on a front portion of the body and are symmetrically provided at two sides of the body; bottom surfaces of the sub-bodies are lower than a bottom surface of the body; wherein rigid sidewalls are symmetrically mounted on side surfaces of the body, rigid sub-sidewalls are symmetrically mounted on side surfaces of the sub-body; portions of the sidewalls and the sub-sidewalls which extend to a bottom of the sidewall planing boat are inserted into water for forming three lifting areas with front openings with the bottom; wherein the power device is mounted on the body and/or the sub-bodies. With the foregoing structure, water resistance of the sidewall planing boat is decreased and a sailing speed in increased.
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