With the development of modern science and technology, human beings rely more and more on electronic technology products. In order to make electronic technology products operate smoothly, we must provide energy for them. Therefore, the power supply mode of "wireless charging" is derived, which brings greater convenience to human life and application.At present, the way of wireless charging is to use electromagnetic induction charging. This way of charging is to use the principle of electromagnetism to generate magnetic field, and then turn the energy generated by magnetic field into usable power energy source. Through a series of devices, the power is transformed from original electricity to magnetism, and then the receiving end receives the power, and receives the magnetic field energy to transform it To generate electric energy, so as to supplement the electric energy needed by the devices with useful electric demand.Through this principle, the transmission of electric energy is charged, the loss of energy is great, resulting in the reduction of conversion efficiency. This paper will focus on the wireless charging technology, how to improve the existing wireless charging technology with low power and short distance to improve the conversion of energy power.