The utility model relates to a vehicle sun shading device, which is characterized by comprising a bracket, a sucker and a sun shading cloth. The sun shading cloth is connected with the bracket and thesucker is fixed on the bracket. When the utility model is used, a support aeration space is formed between the vehicle top and the vehicle sun shading device by sucking the sucker on the vehicle; consequently, the utility model has good dustproof, rain resistant and sunscreen function. When not in use, the utility model can be folded and put away. The utility model has the advantages of simple structure and convenient and quick installation and dismantlement.