Small-sized memory card structure

A small-sized memory card structure comprises a first substrate, a first fin, a second substrate, at least one upper layer memory chip, at least one lower layer memory chip and a packaging glue layer; a plurality of through holes are respectively formed on the first substrate and the second substrate and the metal is filled in a plurality of through holes; the fin is arranged between the first substrate and the second substrate and contacts with the metal in a plurality of through holes; the upper layer memory chip and the lower layer memory chip are respectively arranged on the first substrate and the second substrate; the heat of the upper and lower layer memory chips can be conducted to the fin by the metal in a plurality of through holes and the fin dissipates the heat. The utility model has the efficacies of enhancing the degree of reliability and the service life of the memory card and being more conveniently manufactured.