The invention discloses a pressure sensor and a production method thereof. The pressure sensor comprises two external electrodes, and two substrates which are oppositely arranged and are elastic, wherein a convex structure is arranged on the contact surface of at least one substrate; the contact surfaces are opposite surfaces of the two substrates; the substrates are conductors; each substrate is connected with one external electrode; the surface of the convex structure is covered by a conductive layer. According to the pressure sensor provided by the invention, a piezoresistive effect that under the action of a pressure, the elastic and conductive substrates deform to cause resistance change is utilized, an effect that under the action of a pressure, the contact surface area of the conductive layer on the surface of the convex structure of the substrate changes to cause contact resistance change is utilized, and through a synergistic effect of the two effects, the pressure detection range is greatly widened; compared with the conventional way that a circuit layer is arranged between the two substrates, the contact surface area of the conductive layer in the pressure sensor during deformation of the convex structure changes more, so that the sensitivity and the reliability of the pressure sensor are further improved.