The utility model relates to an environmental-friendly power generation device in offices. The environmental-friendly power generation device comprises a square bottom box with an open upper end and a pedal which can be buckled on the opening of the bottom box, wherein a group of power generation assemblies are arranged inside the bottom box, the power generation assemblies includes four power generation units which form right angles with one another and are in butt joint, each power generation unit comprises a supporting frame and a copper pole piece which is transversely connected on the supporting frame, upper and lower surfaces of the copper pole pieces are adhered with piezoelectric ceramic pieces, elastic pressing pieces arranged above the copper pole pieces are connected between two opposite supporting blocks in the four power generation units, a circular upper pressing block is connected on an intersection of the elastic pressing pieces, the bottom part of the pedal is provided with a circular positioning block which can sleeve the outer side or the inner side of the upper pressing block when the pedal is buckled on the opening of the bottom box, and four lower pressing blocks are arranged below the middle part of the elastic pressing pieces. The environmental-friendly power generation device has the beneficial effects of convenient installation, easy whole machine manufacturing and assembly, low cost, high piezoelectric conversion efficiency, no pollution to the environment, and long service life.