The invention discloses a car tyre deformation power-generation device, which installed between the rim and the tyre inner surface; its features including: it includes the base, the outside cover, the inner set, the magnet, the elastomer, and the coil; the said base is fixed on the rim; the said outside cover is covered on the base mouth, whose top tipping on the tyre inner surface; the said inner set is installed in the base; the said magnet is embedded in the inner set; the said elastomer covering outside the inner set; the said coil winding the lower part of the inner set, and adjacent to the bottom of the magnet. When the car is running, the device converts the tyre deformation by the car weights to the electricity energy. As long as the vehicle is in running process, the coil can generate sustaining current.