Sensor for minimally invasive detection of levodopa and levodopa detection system

The invention discloses a sensor for minimally invasive detection of levodopa and a levodopa detection system. The sensor comprises a substrate, wherein three needle-shaped electrodes, namely a firstworking electrode, a second working electrode and a reference electrode, are fixed to the lower plane of the substrate. The upper ends of the three needle-shaped electrodes are respectively connectedwith conductive sheets, a printed circuit board is fixed at the upper ends of the conductive sheets, and signals of the electrodes can be connected with contacts of the printed circuit board through the conductive sheets. In a use process, the three needle-shaped electrodes penetrate into and stay on the shallow surface layer of the skin of a human body, so that the reaction current detected in the body fluid can be continuously output; and because the surfaces of the first working electrode and the second working electrode are modified by different coatings, the concentration of levodopa canbe calculated in a differen