Abstract: The present invention relates to a sensor, particularly a flexible pressure sensor and a fabrication method thereof. The invention provides a flexible pressure sensor which comprises a sensor body and electrodes. The sensor body comprises a first insulation layer of PET film, a first conductivity layer, an isolation layer, a second conductive layer and a second insulation layer of PET film from top to bottom, respectively. The electrodes are made from the first conductive layer and the second conductive layer connected with external circuit through any electrical wire. The isolation layer is a semi-conductive foamed polymer with adjustable conductivity/resistance. Both of the first insulation layer of PET film and the second insulation layer of PET film have the thickness of 4.5-120 ?m with the surface resistance value of 1013-14. In the process method of the invention, the isolation layer is a foamed polymer with adjustable conductivity.