The invention discloses a photovoltaic power generation cooling device in an automobile. The photovoltaic power generation cooling device is characterized by comprising an automobile body, an instrument panel, a trunk, a solar cell panel, a first temperature detector, a second temperature detector, a small-sized refrigerator, a cold air pipeline, a one-way valve, a storage battery, a getter pump,a first exhaust pipe, a second exhaust pipe, an electric push rod, a sliding plate, a first sensor, a second sensor and a ventilation hole. The photovoltaic power generation cooling device has the advantages of ingenious structure, energy saving, environmental protection and powerful functions; by simple operation, refrigeration cooling of the inner part of the automobile can be realized and further potential safety hazards caused by over-high temperature in the automobile are effectively avoided; light energy can be converted into electric energy, so that the utilization rate of energy is greatly improved; use comfortableness of a driver is improved while the goals of environmental protection and energy saving are reached.