Crystalline silicon type photovoltaic power generation system

The invention relates to a crystalline silicon type photovoltaic power generation system which comprises a plurality of groups of photovoltaic modules, each photovoltaic module comprises a bottom plate, a supporting column fixedly arranged on the bottom plate and a photovoltaic panel rotationally arranged on the supporting column, a fixing groove is formed in the end face of one side of each photovoltaic panel, and an extension plate is slidably arranged in each fixing groove; the photovoltaic panel is provided with a driving piece used for driving the extension plate to move into or out of the fixing groove. When the extension plates are accommodated in the fixing grooves, avoiding gaps are formed between the photovoltaic panels of the two adjacent groups of photovoltaic modules; the photovoltaic panel is fixedly connected with a support, the support is provided with a cleaning assembly located under the receding gap, the cleaning assembly comprises a cleaning motor, a rotating shaft fixedly connected to an