A pressure-relieving backpack, wherein, the pressure-relieving backpack comprises: a backpack body , a pressure-relieving plate , a pressure-relieving assembly, two shoulder straps , and a supporting plate for supporting the backpack body ; the supporting plate is provided at a rear portion of the backpack body , the pressure-relieving plate is provided at a side of the rear portion of the backpack body near back; the pressure-relieving assembly comprises a spring mechanism and a hollow casing ; the casing is mounted at the rear portion of the backpack body , and the spring mechanism is detachably provided inside the casing ; the spring mechanism comprises a compression spring and a retractable rod , the compression spring is sleeved around and position-limited with respect to the retractable rod ; the casing and the retractable rod both have a first end and a second end; the second end of the retractable rod and the compression spring are position-limited within the casing , the first end of the retractable rod is located outside the casing and can be extended and retracted upward and downward relative to the first end of the casing ; the first end of the retractable rod is detachably connected to a lower end of the pressure-relieving plate , an upper end of the pressure-relieving plate is connected to upper ends of the shoulder straps , and lower ends of the shoulder straps are connected to a lower end of a back side of the backpack body ; characterized in that the casing comprises two clamps, an inner wall of each of the clamps protrudes outwardly to form a slideway , two slideways are oppositely disposed, and the retractable rod is located in a chamber formed by the two slideways and can be extended and contracted upward and downward; wherein the two clamps are respectively referred to as a first clamp and a second clamp, the first clamp is fixedly mounted on the rear portion of the backpack body , the slideway of the first clamp faces away from the backpack body , and the second clamp is detachably mounted on the first clamp . the pressure-relieving assembly comprises a spring mechanism and a hollow casing ; the casing is mounted at the rear portion of the backpack body , and the spring mechanism is detachably provided inside the casing ; the spring mechanism comprises a compression spring and a retractable rod , the compression spring is sleeved around and position-limited with respect to the retractable rod ; the casing and the retractable rod both have a first end and a second end; the second end of the retractable rod and the compression spring are position-limited within the casing , the first end of the retractable rod is located outside the casing and can be extended and retracted upward and downward relative to the first end of the casing ; the first end of the retractable rod is detachably connected to a lower end of the pressure-relieving plate , an upper end of the pressure-relieving plate is connected to upper ends of the shoulder straps , and lower ends of the shoulder straps are connected to a lower end of a back side of the backpack body ; characterized in that the casing comprises two clamps, an inner wall of each of the clamps protrudes outwardly to form a slideway , two slideways are oppositely disposed, and the retractable rod is located in a chamber formed by the two slideways and can be extended and contracted upward and downward; wherein the two clamps are respectively referred to as a first clamp and a second clamp, the first clamp is fixedly mounted on the rear portion of the backpack body , the slideway of the first clamp faces away from the backpack body , and the second clamp is detachably mounted on the first clamp . <EOS>