A wireless charging apparatus , comprising: a voltage converting circuit , configured to receive an input voltage and convert the input voltage to obtain an output voltage and an output current of the voltage converting circuit ; a wireless transmitting circuit , configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage converting circuit to conduct wireless charging on a device to-be-charged ; and a first control circuit , configured for wireless communication with the device to-be-charged during the wireless charging to acquire information of a battery of the device to-be-charged and configured to adjust, according to the information of the battery of the device to-be-charged , a duty ratio of a switch transistor of the wireless transmitting circuit to adjust a transmission power of the wireless transmitting circuit , wherein the first control circuit is further configured to obtain, according to the information of the battery of the device to-be-charged , a voltage difference between an input voltage and an output voltage of a step-down circuit of the device to-be-charged and adjust the duty ratio of the switch transistor of the wireless transmitting circuit to make the voltage difference satisfy a preset condition, wherein the first control circuit is configured to adjust the output voltage of the voltage converting circuit to be a first voltage according to an output voltage of the step-down circuit fed back by the device to-be-charged and a preset correspondence relationship between the voltage difference and a charging efficiency, and the first control circuit is configured, after the output voltage of the voltage converting circuit is adjusted to be the first voltage, to adjust the output voltage of the voltage converting circuit to be a second voltage according to an output current of the step-down circuit fed back by the device to-be-charged and a preset current threshold. a voltage converting circuit , configured to receive an input voltage and convert the input voltage to obtain an output voltage and an output current of the voltage converting circuit ; a wireless transmitting circuit , configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage converting circuit to conduct wireless charging on a device to-be-charged ; and a first control circuit , configured for wireless communication with the device to-be-charged during the wireless charging to acquire information of a battery of the device to-be-charged and configured to adjust, according to the information of the battery of the device to-be-charged , a duty ratio of a switch transistor of the wireless transmitting circuit to adjust a transmission power of the wireless transmitting circuit , wherein the first control circuit is further configured to obtain, according to the information of the battery of the device to-be-charged , a voltage difference between an input voltage and an output voltage of a step-down circuit of the device to-be-charged and adjust the duty ratio of the switch transistor of the wireless transmitting circuit to make the voltage difference satisfy a preset condition, wherein the first control circuit is configured to adjust the output voltage of the voltage converting circuit to be a first voltage according to an output voltage of the step-down circuit fed back by the device to-be-charged and a preset correspondence relationship between the voltage difference and a charging efficiency, and the first control circuit is configured, after the output voltage of the voltage converting circuit is adjusted to be the first voltage, to adjust the output voltage of the voltage converting circuit to be a second voltage according to an output current of the step-down circuit fed back by the device to-be-charged and a preset current threshold. <EOS>