A circuit for processing a sampled current, applied to an electromagnetic cooking appliance, comprising: a sampling signal input end (Is) for inputting a current sampling signal; an amplifier for performing a primary amplification on the current sampling signal inputted from the sampling signal input end (Is); a power source; characterized by a switching amplifier circuit for performing a secondary amplification on the current sampling signal amplified by the amplifier; and a feedback circuit for converting the current sampling signal amplified by the switching amplifier circuit into a voltage signal and outputting the voltage signal; wherein the sampling signal input end (Is) is connected to an input end of the amplifier, an output end of the amplifier is connected to an input end of the switching amplifier circuit, an output end of the switching amplifier circuit is connected to an input end of the feedback circuit, and an output end of the feedback circuit is an output end of the circuit for processing the sampled current, wherein: the switching amplifier circuit comprises a transistor, a first capacitor, a second capacitor, and a first resistor; a base of the transistor is connected to the output end of the amplifier, a collector of the transistor is connected to a first end of the first resistor, and a second end of the first resistor is connected to the power source; and an emitter of the transistor is interconnected with a first end of the first capacitor and a first end of the second capacitor, and a second end of the first capacitor and a second end of the second capacitor are both grounded; wherein the switching amplifier circuit is a current amplifier circuit. a sampling signal input end (Is) for inputting a current sampling signal; an amplifier for performing a primary amplification on the current sampling signal inputted from the sampling signal input end (Is); a power source; characterized by a switching amplifier circuit for performing a secondary amplification on the current sampling signal amplified by the amplifier; and a feedback circuit for converting the current sampling signal amplified by the switching amplifier circuit into a voltage signal and outputting the voltage signal; wherein the sampling signal input end (Is) is connected to an input end of the amplifier, an output end of the amplifier is connected to an input end of the switching amplifier circuit, an output end of the switching amplifier circuit is connected to an input end of the feedback circuit, and an output end of the feedback circuit is an output end of the circuit for processing the sampled current, wherein: the switching amplifier circuit comprises a transistor, a first capacitor, a second capacitor, and a first resistor; a base of the transistor is connected to the output end of the amplifier, a collector of the transistor is connected to a first end of the first resistor, and a second end of the first resistor is connected to the power source; and an emitter of the transistor is interconnected with a first end of the first capacitor and a first end of the second capacitor, and a second end of the first capacitor and a second end of the second capacitor are both grounded; wherein the switching amplifier circuit is a current amplifier circuit. the switching amplifier circuit comprises a transistor, a first capacitor, a second capacitor, and a first resistor; a base of the transistor is connected to the output end of the amplifier, a collector of the transistor is connected to a first end of the first resistor, and a second end of the first resistor is connected to the power source; and an emitter of the transistor is interconnected with a first end of the first capacitor and a first end of the second capacitor, and a second end of the first capacitor and a second end of the second capacitor are both grounded; wherein the switching amplifier circuit is a current amplifier circuit.