The invention provides a composite energy collecting device for wind energy and mechanical energy. The composite energy collecting device comprises a vertical vibration piece, a horizontal vibration piece and a stop vibration piece; the vertical vibration piece is arranged along the vertical direction, and the portion rather than the tail end is a swinging portion; the horizontal vibration piece is arranged along the horizontal direction with the tail end vertically fixed on the swinging portion of the vertical vibration piece, and the portion rather than the tail end is a swinging portion; the stop vibration piece is arranged along the horizontal direction with the tail end fixed, the portion rather than the tail end is a swinging portion, the swinging portion of the stop vibration portion extends to the swinging portion of the horizontal vibration piece to be located on the upper/lower side of the swinging portion of the horizontal vibration piece, and projections of the swinging portions of the stop vibration piece and the horizontal vibration piece on the horizontal plane are partially overlapped; at least one of the vertical vibration piece, the horizontal vibration piece and the stop vibration piece is provided with a piezoelectric layer. By the arrangement, wind speed range of efficient collection of the wind energy is expanded, and frequency band is widened.