The invention provides a device for achieving wall surface liquid film thickness multi-point real-time measurement. The device is composed of an electric conduction sensor part, an electric conductionsensor switching circuit and a signal processing circuit; the electric conduction sensor part is mainly composed of an electrode, a wiring terminal, a flexible circuit board, and a lead wire. The function of acquiring and transmitting the liquid film thickness signal under the condition that the wall surface is not damaged is achieved; the sensor switching circuit part can be divided into two parts, namely a sensor switching signal generation circuit and a sensor switching switch circuit, and is mainly composed of a Schmidt trigger, a JK trigger, a decoder, a virtual switch, a filtering circuit, an amplifying circuit, an addition circuit and a wiring terminal, and the switching function of the electric conduction sensor is realized; the signal processing circuit is composed of a rectifying circuit and a filtering circuit, so that the function of preprocessing the output signal of the electric conduction sensor and transmitting the pre-processed signal to the signal receiving device isachieved. On the basis that the wall surface is not transformed, the problem that the existing measuring system cannot achieve multi-point continuous measurement of the liquid film thickness is solved.