Novel amplitude-variable centering machine

The utility model discloses a novel variable-amplitude centering machine which comprises conveyor supporting legs, a variable-amplitude centering machine support and a lead screw stepping motor, the variable-amplitude centering machine support and the lead screw stepping motor are installed on the conveyor supporting legs, a roller used for conveying goods is installed on the inner side of the variable-amplitude centering machine support, and the lead screw stepping motor is installed on the variable-amplitude centering machine support. The width-variable centering machine has the advantages that the space occupation ratio is small, the installation is simple, the width-variable centering machine can be inserted into a conveying line in a multi-section manner, the width size of the guardrail can be freely adjusted through the stepping motor before a material box enters the centering machine line according to the specific size of the material box, the material box can be conveniently and quickly adjusted, and