A steering mechanism of an all-terrain vehicle, comprising: a steering shaft; a power steering system; and an adjusting mechanism comprising a ball joint, a first connecting shaft and a second connecting shaft, wherein the first connecting shaft has a first end provided with a first ball groove, the second connecting shaft has a first end provided with a second ball groove, and each of the first ball groove and the second ball groove is configured to accommodate a partial structure of the ball joint, to allow the first connecting shaft and the second connecting shaft to be rotatably coupled by the ball joint; a second end of the first connecting shaft away from the first ball groove is coupled to the steering shaft, and a second end of the second connecting shaft away from the second ball groove is coupled to the power steering system, wherein the first connecting shaft comprises a first body and a first ball yoke arranged at an end of the first body, and the first ball yoke has the first ball groove; and the second connecting shaft comprises a second body and a second ball yoke arranged at an end of the second body, and the second ball yoke has the second ball groove; and the first ball yoke and the second ball yoke are staggered to enable a partial area of the first ball groove to overlap with a partial area of the second ball groove, and the partial structure of the ball joint is located in an overlap area, characterized in that the ball joint is provided with a first groove cooperating with the first ball yoke and a second groove cooperating with the second ball yoke, along a great circle of the ball joint, and the first groove and the second groove are arranged in a crisscross pattern; and the adjusting mechanism further comprises: a first pin passing through the first ball groove, a partial structure of the first pin being located in the first groove, and both ends of the first pin being fixedly coupled to the first ball yoke; and a second pin passing through the second ball groove, a partial structure of the second pin being located in the second groove, and both ends of the second pin being fixedly coupled to the second ball yoke. a steering shaft; a power steering system; and an adjusting mechanism comprising a ball joint, a first connecting shaft and a second connecting shaft, wherein the first connecting shaft has a first end provided with a first ball groove, the second connecting shaft has a first end provided with a second ball groove, and each of the first ball groove and the second ball groove is configured to accommodate a partial structure of the ball joint, to allow the first connecting shaft and the second connecting shaft to be rotatably coupled by the ball joint; a second end of the first connecting shaft away from the first ball groove is coupled to the steering shaft, and a second end of the second connecting shaft away from the second ball groove is coupled to the power steering system, wherein the first connecting shaft comprises a first body and a first ball yoke arranged at an end of the first body, and the first ball yoke has the first ball groove; and the second connecting shaft comprises a second body and a second ball yoke arranged at an end of the second body, and the second ball yoke has the second ball groove; and the first ball yoke and the second ball yoke are staggered to enable a partial area of the first ball groove to overlap with a partial area of the second ball groove, and the partial structure of the ball joint is located in an overlap area, characterized in that the ball joint is provided with a first groove cooperating with the first ball yoke and a second groove cooperating with the second ball yoke, along a great circle of the ball joint, and the first groove and the second groove are arranged in a crisscross pattern; and the adjusting mechanism further comprises: a first pin passing through the first ball groove, a partial structure of the first pin being located in the first groove, and both ends of the first pin being fixedly coupled to the first ball yoke; and a second pin passing through the second ball groove, a partial structure of the second pin being located in the second groove, and both ends of the second pin being fixedly coupled to the second ball yoke. a first pin passing through the first ball groove, a partial structure of the first pin being located in the first groove, and both ends of the first pin being fixedly coupled to the first ball yoke; and a second pin passing through the second ball groove, a partial structure of the second pin being located in the second groove, and both ends of the second pin being fixedly coupled to the second ball yoke.