The utility model relates to a variable-frequency wireless powering and charging device comprising a power supply base and a wireless powering and charging receiver, wherein the power supply base is electrically connected with a power circuit and a power switching drive circuit through a first microprocessor; the power switching drive circuit is electrically connected to a first resonant circuit which is electrically connected with a first coil and a detection module; the wireless powering and charging receiver is electrically connected with a second resonant circuit through a second coil; the second resonant circuit is electrically connected with a rectification filter circuit and a signal generating circuit; the rectification filter circuit is electrically connected with a detection protection module; the detection protection module and the signal generating circuit are electrically connected with a second microprocessor to lead wireless powering and charging receiver to send signals back to the power supply base after detecting the state of the supplied power by the power supply base, then the power supply base automatically adjusts the output power to reduce the energy transfer loss and greatly reduce the surplus power conversion.