The invention discloses an impedance type humidity sensitive element based on polymer modified silicon dioxide particles available for solution processing and a preparation method of the impedance type humidity sensitive element, and belongs to the technical field of humidity sensitivity material and humidity sensitivity element preparation. On olefinic bond modified silicon dioxide particles, a polar polymer is modified on the silicon dioxide particles by using a free radical polymerization reaction, the silicon dioxide particles are used as skeletons, polymer chains are used for providing hydrophily, and meanwhile the polymer modified silicon dioxide particles can be stably dispersed in a solvent, so that the humidity sensitive element can be prepared by using a solution processing method. According to preparation method of the impedance type humidity sensitive element based on the polymer modified silicon dioxide particles, a humidity sensitive membrane is prepared by processing a substrate surface solution printed with an interdigital electrode, and detection for environmental relative humidity is realized by detecting the impedance of the humidity sensitive element along with the change of humidity. The method is simple and reliable, and low-cost and high-stable batch preparation of the humidity sensitive elements is easy to realize.