A medical imaging device, wherein the medical imaging device comprises: a sliding seat, fixedly arranged on a bed of the medical imaging device, the sliding seat having a slideway extending along a length direction of the bed; a bracket, provided with a moving component and a restraining member, the moving component moving along the slideway, and the restraining member being fitted with the sliding seat to limit a displacement of the bracket in a width direction of the bed; a column, vertically arranged on the bracket; and an X-ray tube assembly, arranged on the column, wherein the sliding seat comprises a rail seat body, the rail seat body being provided with a bottom edge, a connecting edge, a top edge and a bend edge that are connected sequentially, the bottom edge and the top edge being arranged opposite to each other, the connecting edge and the bend edge being opposite to each other and both perpendicular to the bottom edge, the bottom edge, the connecting edge, the top edge and the bend edge together forming the slideway, and the moving component being located in the slideway and contacts the bottom edge, characterized in that the medical imaging device further comprises a first auxiliary support member, wherein the first auxiliary support member is located in the slideway; along a height direction of the bed, a distance between the first auxiliary support member and a bottom surface of the slideway is a first distance, and a distance between the first auxiliary support member and a top surface of the slideway is a second distance; and the second distance is configured such that when the X-ray tube assembly rotates around a central axis of the column to make the column have a tendency to overturn, the first auxiliary support member abuts against the top edge. a sliding seat, fixedly arranged on a bed of the medical imaging device, the sliding seat having a slideway extending along a length direction of the bed; a bracket, provided with a moving component and a restraining member, the moving component moving along the slideway, and the restraining member being fitted with the sliding seat to limit a displacement of the bracket in a width direction of the bed; a column, vertically arranged on the bracket; and an X-ray tube assembly, arranged on the column, wherein the sliding seat comprises a rail seat body, the rail seat body being provided with a bottom edge, a connecting edge, a top edge and a bend edge that are connected sequentially, the bottom edge and the top edge being arranged opposite to each other, the connecting edge and the bend edge being opposite to each other and both perpendicular to the bottom edge, the bottom edge, the connecting edge, the top edge and the bend edge together forming the slideway, and the moving component being located in the slideway and contacts the bottom edge, characterized in that the medical imaging device further comprises a first auxiliary support member, wherein the first auxiliary support member is located in the slideway; along a height direction of the bed, a distance between the first auxiliary support member and a bottom surface of the slideway is a first distance, and a distance between the first auxiliary support member and a top surface of the slideway is a second distance; and the second distance is configured such that when the X-ray tube assembly rotates around a central axis of the column to make the column have a tendency to overturn, the first auxiliary support member abuts against the top edge.