A wireless charging circuit for a power supply device, the wireless charging circuit comprising: an inverter module, a power supply module, a first processing module, a first communication module and a first coil component, wherein the first coil component comprises: a coil gating submodule, a switching submodule and at least two coils; the coils are configured to be distributed at different positions of the power supply device; and the switching submodule is connected to the first processing module and the coil gating submodule respectively; the inverter module is connected to each coil by using the coil gating submodule; the first processing module is configured to: detect a writing position of a stylus on a screen, select a target coil from the coils in the first coil component based on the writing position, and send information of the selected target coil to the switching submodule; and the switching submodule is configured to: control the coil gating submodule to gate a path between the target coil and the inverter module based on the information of the target coil; the inverter module is configured to: obtain a direct current signal, convert the direct current signal into a first alternating current signal at a target resonant frequency, and output the first alternating current signal to the first coil component, wherein the target resonant frequency is at an MHz level; the first coil component is configured to emit a wireless charging signal based on the first alternating current signal; characterized in that the first communication module is configured to receive a charging request from the stylus, and send the charging request to the first processing module; and further configured to receive a charging stop request from the stylus, and send the charging stop request to the first processing module; wherein the first processing module is further configured to: control the inverter module to start operating when it is determined, based on the charging request, to charge the stylus; and control the inverter module to stop operating when it is determined, based on the charging stop request, to stop charging the stylus; wherein the first communication module is further configured to receive a required charging power from the stylus, and send the required charging power to the first processing module; the power supply module is further configured to send power supply information to the first processing module; the first processing module specifically configured to determine a first target power of the inverter module based on the power supply information, and the required charging power, and send the first target power to the inverter module; the inverter module is configured to adjust the output power of the inverter module to the first target power. the switching submodule is connected to the first processing module and the coil gating submodule respectively; the inverter module is connected to each coil by using the coil gating submodule; the first processing module is configured to: detect a writing position of a stylus on a screen, select a target coil from the coils in the first coil component based on the writing position, and send information of the selected target coil to the switching submodule; and the switching submodule is configured to: control the coil gating submodule to gate a path between the target coil and the inverter module based on the information of the target coil; the inverter module is configured to: obtain a direct current signal, convert the direct current signal into a first alternating current signal at a target resonant frequency, and output the first alternating current signal to the first coil component, wherein the target resonant frequency is at an MHz level; the first coil component is configured to emit a wireless charging signal based on the first alternating current signal; characterized in that the first communication module is configured to receive a charging request from the stylus, and send the charging request to the first processing module; and further configured to receive a charging stop request from the stylus, and send the charging stop request to the first processing module; wherein the first processing module is further configured to: control the inverter module to start operating when it is determined, based on the charging request, to charge the stylus; and control the inverter module to stop operating when it is determined, based on the charging stop request, to stop charging the stylus; wherein the first communication module is further configured to receive a required charging power from the stylus, and send the required charging power to the first processing module; the power supply module is further configured to send power supply information to the first processing module; the first processing module specifically configured to determine a first target power of the inverter module based on the power supply information, and the required charging power, and send the first target power to the inverter module; the inverter module is configured to adjust the output power of the inverter module to the first target power.