A power generation apparatus and a touch apparatus with grain materials are provided. The power generation apparatus includes a grain material layer, a first electrode, an electric material layer, a second electrode and a conductive wire. The first electrode is electrically connected to the grain material layer. The electric material layer corresponds to the grain material layer, and a gap is formed between the grain material layer and the electric material layer. The second electrode is electrically connected to the electric material layer. The conductive wire is electrically connected to the first electrode and the second electrode. The grain material layer and the electric material layer interact with each other to generate a current or a voltage. Thereby, the present invention can generate power by utilizing a grain material. |