The invention relates to an electrical impedance tomography device of electrodes 32. Channel 32 multi-way switches are adopted for constructing an electrical impedance tomography system of an electrode 32 physical model, in this way, the complexity of obtaining channels 32 through connecting channel 16 multi-way switches in parallel is lowered, control is easier compared with simulation matrix switches, performance is better, and the collection precision of the system is improved. For a control module, a processor ARM9 is adopted according to the design, serves as an embedded microprocessor of the electrical impedance tomography system, has high control capacity and data processing capacity, and improves the collection speed and real-time performance of the system, and many interfaces facilitate expanding of more functions of the system. In addition, for a high-precision instrument amplifier, a variable gain amplifying circuit is further introduced, the high-precision instrument amplifier and the variable gain amplifying circuit form a two-stage amplifying circuit, in this way, changes of gains can be controlled in a programmed mode, the amplification factor of collected voltage signals is increased, the flexibility of the collected voltage signals is improved, and follow-up processing of the signals is facilitated.