Inner tube type piezoelectric power generation device

The invention relates to an inner tube type piezoelectric power generation device. The device is mainly composed of an inner tube (3), prismatic frustum-shaped elastic bodies (5) contained in the inner cavity of the inner tube (3), and power generation layers (7); vent holes (4) are uniformly formed in tube walls at two sides of the inner tube (3) respectively; a plurality of groups of prismatic frustum-shaped elastic bodies (5) are provided; cavity structures (6) which are formed between every two groups of prismatic frustum-shaped elastic bodies (5) are communicated with the vent holes (4); and one power generation layer (7) is arranged between two prismatic frustum-shaped elastic bodies in each group of prismatic frustum-shaped elastic bodies. The inner tube type piezoelectric power generation device of the invention is simple in structure. When the inner tube type piezoelectric power generation device is used, existing matured vehicle trims and hub structures only need to be slightly modified or need no modification; the inner tube type piezoelectric power generation device can be directly installed on straight base rims of buses and trucks; and therefore, the application range of the inner tube type piezoelectric power generation device is very wide.