Unit type photovoltaic wall structure applied to fabricated building

The invention discloses a unit type photovoltaic wall structure applied to a fabricated building, and relates to the technical field of photovoltaic walls. The heat preservation wall specifically comprises a wall body support, a heat preservation wall plate is arranged on the inner side of the wall body support, a heat preservation cavity is formed in the wall body support, a plurality of electrically-controlled upper vent valves and lower vent valves are arranged between the inner side of the wall body support and the heat preservation cavity, and a plurality of mounting grooves are formed in the outer side face of the wall body support. When the internal temperature of the heat preservation cavity is higher than the indoor temperature, the upper vent valve and the lower vent valve are opened, the temperature difference in air forms a chimney effect in the heat preservation cavity, so that the air in the heat preservation cavity and indoor air form circulation, and then the indoor temperature is maintained t