The invention discloses a humidity sensor of combination of polyelectrolyte and intrinsic conducting polymer and the fabricating method. It adopts glass ceramic as substrate and multiple pairs of interdigital golden electrodes are set on it. Humidity film of combination of poly 4-vinypyridine with cross-linking quaternary amination and polypyrole is coated on surface of glass ceramic and interdigital golden electrode. The invention is provided with simple preparing process and low cost. It is suitable for mass production especially. Prepared humidity sensors are all provided with moderate resistance, high sensitivity, good linearity, quick response, good recurrence, strong stability and measuring in room temperature so on in wide humidity range, especially in circumstance with middle-low humidity (0-60%). It can be applied in production process of industry and agriculture, storage and accurate measurement and control for circumstance humidity when air circumstance is monitored.