Ionization chamber small signal monitoring device

An ionization chamber small signal monitoring device disclosed by the present invention comprises a voltage output module and a connection switching module, a first voltage of the voltage output module is connected with a first electrode plate of an ionization chamber, and one end of the connection switching module is connected with a second electrode plate of the ionization chamber. The signal amplification module is sequentially connected with the data conversion module, the signal processing module and the control module, and the control module is used for controlling the switching module to be connected with the voltage output module or the signal amplification module. And controlling the voltage output module to output a first voltage or a second voltage with opposite polarities and the same voltage value. The connection switching module is added, so that the second electrode plate is selectively communicated with the second voltage, B ions in the ionization chamber are fully collected, and compared with