The invention discloses a heat sink applied to different solid state hard disks of various specifications, comprising a heat sink base, a heat sink fin and compression springs. The heat sink fin is fixed on the heat sink base through the compression springs, and a hard disk is arranged between the heat sink fin and the heat sink base. The hard disk comprises a hard disk I and a hard disk II. The heat sink base is fixed in the corresponding position of a main board, the solid state hard disk (the hard disk I needs to cooperate with an extension block) is arranged on the heat sink base, and thesolid state hard disk is fixed with plastic buckles. The heat sink fin is attached to the solid state hard disk, and the bumps of the heat sink fin correspond to the corresponding grooves of the heatsink base, and then the compression springs are matched with heat sink fin grooves via compression rods, and support rods are matched with heat sink fin hooks, and positioning angles are matched withpositioning holes of the compression springs, so that the heat sink fin is pressed on the solid state hard disk, the heat sink fin and the solid state hard disk are attached more tightly, and the heatdissipation function is better played.