The invention discloses a reactive power control method for a low-voltage power distribution transformer district with distributed photovoltaics. A distributed photovoltaic power supply, a photovoltaic inverter and a capacitor are arranged in the low-voltage power distribution transformer district. The reactive power control method comprises the following process of (S1) dividing a reactive powercontrol interval according to the voltage and power factor range of the transformer district, (S2) collecting low-voltage side voltage and power factors in the low-voltage power distribution transformer district, determining the reactive power control interval of a current transformer district according to the range of the voltage and the power factors and adjusting the reactive output of the photovoltaic inverter and the capacitor according to a control strategy corresponding to the reactive power control interval to achieve the reactive power adjustment of the low-voltage power distributiontransformer district. The operation interval of the transformer district is divided according to the voltage and power factors of the transformer district, the equipment such as a capacitor, an SVG and a photovoltaic inverter in the transformer district is controlled in real time according to a control strategy, and the reasonable scheduling of the transformer district voltage and power factors isensured.