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.