Non-contact current signal detection device and detection method based on stm32

The invention provides a non-contact current signal detection device based on stm32. A current sampling module comprises a coil and a sampling circuit; the coil converts current flowing through the circuit into a magnetic field through electromagnetic induction, and then the coil converts the current into an electric field to recover the current; the sampling circuit samples and amplifies the current in the coil, and then the current is processed by a signal conditioning module; the signal conditioning module comprises an emitter follower, a filter and an operational amplifier; the emitter follower prevents a post-stage circuit from influencing a pre-stage current sampling circuit; the operational amplifier module conditions a current sampling signal to be within a range which can be accepted by a single-chip microcomputer, the signal within the amplitude range which can be detected by the single-chip microcomputer is directly transmitted to the single-chip microcomputer, and a small signal which cannot be de