A hinge for a freezer, comprising: a base, provided with a first flange portion at a left side of the base, and provided with a second flange portion opposite to the first flange portion at a right side thereof, the first flange portion and the second flange portion being provided with sliding grooves opposite to each other; a connecting seat, pivotally connected to an upper part of the base, provided with a third flange portion adjacent to the first flange portion at a left side of the connecting seat, and provided with a fourth flange portion adjacent to the second flange portion at a right side thereof; a first pivot shaft, provided to the upper part of the base, and having a left end pivotally connected to the first flange portion and third flange portion, and a right end pivotally connected to the second flange portion and the fourth flange portion; a second pivot shaft parallel to the first pivot shaft, having a left end connected to the third flange, and a right end connected to the fourth flange, wherein both ends of the second pivot shaft are slidable in the corresponding sliding grooves of the first flange portion and the second flange portion respectively; a guide rod, having an upper end pivotally connected to the second pivot shaft; a supporting seat, provided to a lower part of the base, wherein a lower end of the guide rod penetrates the supporting seat; a positioning part provided to the guide rod; a spring sheath, fitted over the guide rod and movable between the positioning part and the supporting seat; and a spring, fitted over the spring sheath and located between the positioning part and the supporting seat, wherein the guide rod is provided with an external thread, characterized in that the positioning part is a nut threaded to the guide rod, and wherein a washer threaded to the guide rod is provided under the nut, and whereby the spring sheath comprises a round tube portion fitted over the guide rod, and an annular flange portion provided on an upper end of the round tube portion, and an upper end of the annular flange portion abuts against a lower end of the washer. a base, provided with a first flange portion at a left side of the base, and provided with a second flange portion opposite to the first flange portion at a right side thereof, the first flange portion and the second flange portion being provided with sliding grooves opposite to each other; a connecting seat, pivotally connected to an upper part of the base, provided with a third flange portion adjacent to the first flange portion at a left side of the connecting seat, and provided with a fourth flange portion adjacent to the second flange portion at a right side thereof; a first pivot shaft, provided to the upper part of the base, and having a left end pivotally connected to the first flange portion and third flange portion, and a right end pivotally connected to the second flange portion and the fourth flange portion; a second pivot shaft parallel to the first pivot shaft, having a left end connected to the third flange, and a right end connected to the fourth flange, wherein both ends of the second pivot shaft are slidable in the corresponding sliding grooves of the first flange portion and the second flange portion respectively; a guide rod, having an upper end pivotally connected to the second pivot shaft; a supporting seat, provided to a lower part of the base, wherein a lower end of the guide rod penetrates the supporting seat; a positioning part provided to the guide rod; a spring sheath, fitted over the guide rod and movable between the positioning part and the supporting seat; and a spring, fitted over the spring sheath and located between the positioning part and the supporting seat, wherein the guide rod is provided with an external thread, characterized in that the positioning part is a nut threaded to the guide rod, and wherein a washer threaded to the guide rod is provided under the nut, and whereby the spring sheath comprises a round tube portion fitted over the guide rod, and an annular flange portion provided on an upper end of the round tube portion, and an upper end of the annular flange portion abuts against a lower end of the washer.