An artificial vertebra fixing system, comprising: an artificial vertebra main body, arrangeable between adjacent human physiological vertebrae; two longitudinal connecting rods, respectively arrangeable at two sides of spinous processes of the human physiological vertebrae; transverse connecting screws, connected between the artificial vertebra main body and each of the longitudinal connecting rods _, respectively; and connecting portions, connected to the artificial vertebra main body, the connecting portions being provided with a self-tapping through hole or a threaded hole, when the connecting portions are provided with the self-tapping through hole, each of the transverse connecting screws being formed into thread structure by self-tapping when being screwed to the self-tapping through hole, and when the connecting portions are provided with the threaded hole, each of the transverse connecting screws being matched with the threaded hole, characterised in that, the artificial vertebra main body comprises earring structures; the connecting portions are penetrated into a connecting hole of the earring structures; wherein each connecting portion comprises a connecting portion main body and a rotation stopping portion arranged on the connecting portion main body; the rotation stopping portion is abutted against and matched with a limiting portion of the artificial vertebra main body, the rotation stopping portion is an arc block, the limiting portion is arranged on the connecting portion main body and is of a semicircular structure; the arc block and the limiting portion are closely attached; each connecting portion further comprises a locking mechanism; each connecting portion is limited in the connecting hole by the locking mechanism, a clamping step is arranged in the connecting hole of each earring structure; the locking mechanism is matched with the clamping step, the locking mechanism comprises a first fixture block and a second fixture block that are arranged oppositely; the first fixture block and the second fixture block are protruded from the connecting portion main body on a radial direction of the connecting portion main body; a deformation gap is formed between the first fixture block and the second fixture block. an artificial vertebra main body, arrangeable between adjacent human physiological vertebrae; two longitudinal connecting rods, respectively arrangeable at two sides of spinous processes of the human physiological vertebrae; transverse connecting screws, connected between the artificial vertebra main body and each of the longitudinal connecting rods _, respectively; and connecting portions, connected to the artificial vertebra main body, the connecting portions being provided with a self-tapping through hole or a threaded hole, when the connecting portions are provided with the self-tapping through hole, each of the transverse connecting screws being formed into thread structure by self-tapping when being screwed to the self-tapping through hole, and when the connecting portions are provided with the threaded hole, each of the transverse connecting screws being matched with the threaded hole, characterised in that, the artificial vertebra main body comprises earring structures; the connecting portions are penetrated into a connecting hole of the earring structures; wherein each connecting portion comprises a connecting portion main body and a rotation stopping portion arranged on the connecting portion main body; the rotation stopping portion is abutted against and matched with a limiting portion of the artificial vertebra main body, the rotation stopping portion is an arc block, the limiting portion is arranged on the connecting portion main body and is of a semicircular structure; the arc block and the limiting portion are closely attached; each connecting portion further comprises a locking mechanism; each connecting portion is limited in the connecting hole by the locking mechanism, a clamping step is arranged in the connecting hole of each earring structure; the locking mechanism is matched with the clamping step, the locking mechanism comprises a first fixture block and a second fixture block that are arranged oppositely; the first fixture block and the second fixture block are protruded from the connecting portion main body on a radial direction of the connecting portion main body; a deformation gap is formed between the first fixture block and the second fixture block.