The invention discloses a photovoltaic grid connected inverter reactive output control method, and belongs to the technical field of automation of a power system. A reactive output plan of each inverter is calculated according to such information as a scheduled and issued voltage set value, reactive compensation equipment running information, and current active output, current reactive output, power factor upper and lower limit values of the inverters and the like through consideration of response time factors of the inverters to background control instructions. According to the invention, reactive adjustment can be carried out through effective development and utilization of the inverters, reactive support can be provided for a power grid at any time, and dynamic reactive compensation equipment investment can also be reduced for a photovoltaic power station.