The invention discloses a dynamic voltage stabilizer of a power distribution network. The dynamic voltage stabilizer comprises an isolation transformer, a single-phase uncontrolled rectifier bridge, a direct current bus capacitor, a single-phase H-bridge inverter, a low-pass inductance-capacitance filter and a by-pass switch, wherein the primary side of the isolation transformer is connected with a power grid, the secondary side of the isolation transformer is connected with the alternating current side of the single-phase uncontrolled rectifier bridge, the single-phase uncontrolled rectifier bridge, the direct current bus capacitor and the single-phase H-bridge inverter are connected in parallel, the alternating current side of the single-phase H-bridge inverter is connected with the low-pass inductance-capacitance filter, and the by-pass switch is connected with a capacitor of the low-pass inductance-capacitance filter. The invention also discloses a control strategy of the dynamic voltage stabilizer. According to the dynamic voltage stabilizer of the power distribution network, a half-cycle Posicast control method is introduced in the traditional proportional resonant control, DVR (Discharge Voltage Regulator) dampness is increased, large high-frequency gain is achieved, the sensitivity of the system to noise is reduced, the underdamping effect caused by the low-pass inductance-capacitance filter can be effectively inhibited and the transient response characteristic of the DVR is greatly improved.