The invention discloses a device for increasing the recovery ratio of shale gas through arc-surface three-combination energy-gathered fracturing. The device comprises an initiation device and a gas conveying device, the initiation device comprises a three-combination energy gathering device, an initiation circuit and an initiator, the three-combination energy gathering device comprises a left energy gathering cover capable of gathering the explosion energy of an explosive and ejecting out to the right, a right energy gathering cover capable of gathering the explosion energy of the explosive and ejecting out to the left, and a center energy gathering cover capable of gathering the explosion energy of the explosive and ejecting out to the center, both the left energy gathering cover and theright energy gathering cover are rotary paraboloids with openings facing outwards, and the center energy gathering cover is a rotary paraboloid with an opening facing outwards. Compared with the priorart, due to the energy gathering effects of the left energy gathering cover, the center energy gathering cover and the right energy gathering cover, the shale in an explosive fracturing region is respectively extruded from three spatial directions of left, right and center at the same time, a crack rapidly penetrates through to form a shale fracture zone shaped like a Chinese character Ge, and the specific surface area of the shale is increased, so that the resolution rate and the recovery ratio of the shale gas are effectively increased.