The invention relates to a current mode photovoltaic grid-connected inverter low voltage ride through control method, a switching tube SW and a diode D are added to the direct current side of a three-phase current mode grid-connected inverter in the prior art, the switching tube SW is used for controlling the direct current stability when the grid voltage drops, and the diode D is used for providing a follow current path for a DC energy storage inductor. The grid voltage ug is acquired through a sensor, and a per-unit value uT of the grid voltage is calculated. In normal condition, the switching tube SW maintains normally open state, and when the uT is less than a voltage drop limiting value Uth bear by the normal mode, the inverter control mode is switched into a low voltage ride through control mode. According to the invention, the current mode grid-connected inverter is enable to have good low voltage ride through ability, the inverter can maintain the direct current stable without losing control and no overcurrent on line side when the grid voltage drops seriously, the current mode grid-connected inverter has low voltage ride through ability while realizes system unit power factor operation in the normal condition.