A snow protection device mainly includes a piece of waterproof cloth, two bars, and at least two rubber magnets. The waterproof cloth includes a piece of cloth that is light-weighted, windable, and resistant against penetration of water. The two bars are respectively mounted to opposite side edges of the waterproof cloth. The rubber magnets are of magnetic attraction and are flexible and are arranged on the waterproof cloth at locations adjacent to and beside the bars. As such, the two bars can be used to collapse and expand the waterproof cloth and the rubber magnets may be securely attached, by means of magnetic attraction, to locations around a windshield so as to securely hold the waterproof cloth in position. The waterproof cloth is thus set to shield and cover the windshield. The resistance against water penetration of the waterproof cloth prevents water from contacting and being frozen on the windshield.