The invention provides a city-class high-density multipoint distributed photovoltaic cluster monitoring method having the functions such as information acquisition and monitoring, photovoltaic generation power prediction and dispatching management and based on a three-layer architecture. The method comprises the steps of dividing the architecture of a city-class high-density multipoint distributed photovoltaic cluster monitoring method into three layers by the functions of the parts, performing data acquisition and processing on corresponding city-class high-density multipoint distributed photovoltaic power generation units by use of a photovoltaic monitoring control unit, thereby obtaining the daily generation, the total cost of daily generation and a generation predicted value, obtaining the daily generation fee, the daily generation cost and the predicted generation within the region by a regional photovoltaic management module, obtaining the whole-city daily generation, the whole-city daily generation cost, the whole-city historical generation cost and the whole-city predicted generation by a city-class monitoring control center, accepting an instruction from a superior system and issuing an instruction to the regional photovoltaic management module by the city-class monitoring control center, and transmitting the photovoltaic inverter on/off and electric energy quality regulating signals of field equipment to the photovoltaic monitoring control unit.