The utility model provides an automatic car sun visor utensil of sunshade, utilize the principle that coefficient of expansion different of different metals along with the temperature variation, set up a bimetallic strip along with temperature variation coefficient of expansion difference, other makes up the support become with rotatable fixed point and to extend the folding support, install the puggaree on can extending the folding support, again the bimetallic strip aggregate erection on can extending the folding support, bimetallic strip meets high temperature expansion when the temperature risees, the coefficient of expansion of two kinds of metals of bimetallic strip take place crookedly owing to being different, crooked bimetallic strip drives and struts and shelter from sunshine rather than connecting fixed extended folding support and puggaree, reduce or temperature bimetallic strip reconversion when reducing as sunshine intensity, rather than connecting fixed extended folding support and puggaree automatic retraction, can also set up the condensing lens concentrates sunshine and shines to bimetallic strip, make it can obtain the temperature fast and fast to the change of temperature and produce the change of form, low in manufacturing cost is honest and clean still very simple light practical.