The invention provides a negative voltage rectification circuit and a high strength gas discharge lamp. The negative voltage rectification circuit comprises a transformer, an MOS tube, a rectifier diode, a positive voltage power source and a driver chip used for generating a PWM signal, wherein the transformer comprises a primary coil and a secondary coil, the positive voltage power source is connected with one end of the primary coil, the other end of the primary coil is connected with a drain electrode of the MOS tube, a source electrode of the MOS tube is in grounding connection, a grid electrode of the MOS tube is connected with a PWM signal output end of the driver chip through a first resistor, a positive electrode of the rectifier diode is connected with one end of the secondary coil of the transformer, a negative electrode of the rectifier diode is in grounding connection, and the other end of the secondary coil of the transformer generates negative high voltage to drive the high strength gas discharge lamp to operate. The negative voltage rectification circuit improves operation reliability of the lamp, prolongs service life of the lamp and guarantees normal and stable operation of the lamp.