Knapsack tool system and knapsack power supply device thereof

The invention discloses a knapsack tool system and a knapsack power supply device thereof. The knapsack power supply device comprises a battery pack, a main body and wearable equipment, wherein the battery pack is used for outputting electric energy; the main body is used for bearing the battery pack; the battery pack is detachably connected with the main body; the main body defines a symmetry plane; the main body is at least partially symmetric about the symmetry plane; the main body defines a height direction; the wearable equipment is connected to the main body for a user to wear so as to carry the main body on the back; the wearable equipment comprises backstraps; each backstrap comprises an upper end connected to the upper part of the main body; when the user wears the wearable equipment, an acting force is applied to the main body by the upper end of each backstrap; an included angle between the projection of the direction of the acting force in the symmetry plane and a height direction is not less than