Abstract: A triboelectric nanosensor includes an elastic body, a liquid metal and a wire. The elastic body includes an inner wall surrounding a chamber, and a plurality of biomimetic shark placoid scale-shaped microstructures adjacent to each other and disposed at at least one portion of the inner wall. The liquid metal is located within the chamber and surrounded by the elastic body. The wire is electrically connected to the liquid metal. The elastic body is pressed to be deformed and restores to change a contact state between the liquid metal and the biomimetic shark placoid scale-shaped microstructures, thereby allowing a plurality of electrons to flow into the liquid metal via the wire or to flow out from the liquid metal via the wire.