The invention belongs to the technical field of an annular angle displacement sensor, and specifically relates to a composite conductive plastic triple-redundancy high-precision angle displacement sensor which satisfies a high-reliability large-power kilowatt rocket servo mechanism and which can achieve high precision, high temperature resistance and redundancy design. The composite conductive plastic triple-redundancy high-precision angle displacement sensor comprises 3 resistor assemblies (1), 3 electric brush assemblies (2), an upper cover (3), a lower cover (4), a shaft (5), a pin (6), 2 intermediate rings (7), 2 bearings (8) and 3 connection sleeves (18). Advantages of good linearity, high precision and good stability can be achieved, the reliability index has leap and bound improvement, the basic technology is relatively mature, and implementation is easy.