The application provides a pressure sensor and a wearable device. The pressure sensor includes a circuit board and a conducting elastic structure; the circuit board includes an electrode area which includes multiple electrode pairs set at intervals; the conducting elastic structure is set on one side of the circuit board and includes a first area; the first area includes a conducting part; when no pressure is applied to the conducting elastic structure, the conducting part is isolated from each electrode pair, so that each electrode pair is in an off state; when a pressure which is greater than a turn-on pressure threshold is applied to the conducting elastic structure, the conducting elastic structure deforms, so that the conducting part contacts with at least one electrode pair, and at least one electrode pair is turned on; wherein the turn-on pressure thresholds of different electrode pairs are different.