Multilayered sensor based on ECT direct three-dimensional imaging system

The invention discloses a multilayered sensor based on an ECT direct three-dimensional imaging system. The multilayered sensor is arranged on a pipeline of a to-be-tested object. The multilayered sensor is characterized by comprising N electrode layers which are axially arranged on the pipeline, wherein each electrode layer consists of M electrode plates which are arranged at equal intervals in the peripheral direction of the pipeline to form an electrode array; the rotating angel of two adjacent layers of the M electrode layers is alpha, a shielding hood is arranged outside the electrode layers and is grounded, and the electrode plates are not connected with the shielding hood. Not only can the capacitance value among electrode plates in the same layer be acquired, but also the capacitance value among electrode plate pairs in different layers can be acquired. The multilayered sensor avoids the defect that the conventional ECT imaging technology is low in axial resolution and the two-dimensional tomographic imaging error is great, and can effectively acquire a relatively high quality three-dimensional reconstructed image.