Wireless power supply technology is a kind of weak power supply methods,is different from the traditional power supply model,does not need any real connection,can conduct electronic power transmission through non-metal materials and therefore can transmit the electric power to electric devices under the condition of non-connection.The wireless power supply technology is convenient and safe has broad development prospect.By using single chip machine technology and by applying the principle of electromagnetic coupling,a simple wireless power supply system is designed,in the design,single chip machine AT89C2051 is used to produce signal which is sent out by transmitting circle,electric power is transmitted to its circuit and then the power is supplied to the load.According to the need of the load,single chip machine AT89C2051 can supply the power by producing th esignal of two kinds of frequencies.