Tire capable of automatically detecting speed

The utility model provides a tire capable of automatically measuring speed. The tire comprises a speed measuring device and a tire body, the number of the speed measuring devices is N, N is a natural number larger than 2, and the speed measuring devices are implanted into the tire and comprise speed sensors and power supply units; the power supply unit comprises a magnetic induction line cutting power supply unit, a space magnetic field and a connecting wire; the magnetic induction line cutting power supply unit rotates along with the tire, performs magnetic induction line cutting motion in a space magnetic field, and generates electric energy to be provided for the speed sensor to work. According to the utility model, the real-time displacement state of the tire can be intelligently detected, the problem of power supply of elements in the tire is innovatively solved by utilizing a magnetic field cutting mode, the existing tire structure is innovated, and a power supply structure and a speed sensor are introd