An amplitude limiting oscillation circuit, comprising: an oscillation circuit , configured to generate an oscillation signal; a pulse width modulation circuit , configured to generate a pulse width modulation signal according to an amplitude of the oscillation signal; a low pass filtering circuit , configured to convert the pulse width modulation signal into a direct current control voltage signal; and a voltage controlled resistance circuit , configured to change a resistance value of the voltage controlled resistance circuit under control of the direct current control voltage signal, to control the amplitude of the oscillation signal; wherein the oscillation circuit comprises a positive output end and a negative output end; characterized in that the amplitude limiting oscillation circuit further comprises: a switching circuit , configured to switch between a connection of the positive input end and the pulse width modulation circuit and a connection of the negative output end and the pulse width modulation circuit ; the switching circuit comprises: a third comparator , an inverter , a first switch , a second switch , a third switch and a fourth switch ; wherein a positive input end of the third comparator is connected to the positive output end of the oscillation circuit , a negative input end of the third comparator is connected to the negative output end of the oscillation circuit , an input end of the inverter is connected to an output end of the third comparator , an output signal of the third comparator is used to control the first switch and the fourth switch , and an output signal of the inverter is used to control the second switch and the third switch . an oscillation circuit , configured to generate an oscillation signal; a pulse width modulation circuit , configured to generate a pulse width modulation signal according to an amplitude of the oscillation signal; a low pass filtering circuit , configured to convert the pulse width modulation signal into a direct current control voltage signal; and a voltage controlled resistance circuit , configured to change a resistance value of the voltage controlled resistance circuit under control of the direct current control voltage signal, to control the amplitude of the oscillation signal; wherein the oscillation circuit comprises a positive output end and a negative output end; a switching circuit , configured to switch between a connection of the positive input end and the pulse width modulation circuit and a connection of the negative output end and the pulse width modulation circuit ; the switching circuit comprises: a third comparator , an inverter , a first switch , a second switch , a third switch and a fourth switch ; wherein a positive input end of the third comparator is connected to the positive output end of the oscillation circuit , a negative input end of the third comparator is connected to the negative output end of the oscillation circuit , an input end of the inverter is connected to an output end of the third comparator , an output signal of the third comparator is used to control the first switch and the fourth switch , and an output signal of the inverter is used to control the second switch and the third switch . a third comparator , an inverter , a first switch , a second switch , a third switch and a fourth switch ; wherein a positive input end of the third comparator is connected to the positive output end of the oscillation circuit , a negative input end of the third comparator is connected to the negative output end of the oscillation circuit , an input end of the inverter is connected to an output end of the third comparator , an output signal of the third comparator is used to control the first switch and the fourth switch , and an output signal of the inverter is used to control the second switch and the third switch . <EOS>