The invention relates to an optical electric galvanometer, based on Micro-Electronic Mechanic System (MEMS). It is characterized in that: it use micro mechanical technique to prepare the screw coil MEMS torsion micro lens; it can avoid amplify circuit, that directly inputting the tested current or low-frequency weak current into driving coil, to be arranged in the strong magnetic field generated by external permanent magnet; the driving coil drives the micro lens to deflect from original position by the torque generated by Lorentz force; it uses dual optical fiber collimator to test the characters that sensitive to the angle; according to the relationship between the optical signal loss and the torsion angle, via optical electric conversion and signal processing, attaining the current value. The invention can avoid amplify circuit at the input end, to attain amp level and pF level, to overcome the defects of noise disturb and excursion when amplifying the micro weak current signal. Andit can realize the optical electric separation at input and output ends synchronously, with small volume, simple structure, lower cost and better anti-vibration ability.