The invention discloses an electric solar protection device for automobiles. The electric solar protection device comprises a slide cylinder, a telescoping driving motor, two belt wheels, a belt, a sliding plate frame, a folding and unfolding driving motor, a folding and unfolding driving gear, a folding and unfolding driven gear, a group of support rods, a pair of slide hinges, a pair of folding and unfolding shifting rods, a wind and rain sensing switch and sun cloth. The electric solar protection device is characterized in that two ends of one side of the slide cylinder are provided with two holes respectively, and the telescoping driving motor, the two belt wheels and the belt are mounted on one side, with the hole, of the slide cylinder; the sliding plate frame is mounted in the slide cylinder and fixed onto the belt, and the folding and unfolding driving motor, the folding and unfolding driving gear and the folding and unfolding driven gear are mounted in the sliding plate frame; the group of support rods is mounted on the sliding plate frame, and the pair of slide hinges is mounted on the support rods on two sides respectively; one of the folding and unfolding shifting rods is connected with a shaft of the folding and unfolding driving motor and one of the slide hinge, and the other one of the folding and unfolding shifting rods is connected with a rotating shaft of the folding and unfolding driven gear and the other one of the slide hinge; the wind and rain sensing switch is fixedly mounted above the outer side of the slide cylinder; the sun cloth is penetratingly attached onto the support rods.