The invention discloses a cross-shaped head mechanism structure of a connecting rod of a fracturing pump. The cross-shaped head mechanism comprises the connecting rod, wherein the connecting rod is connected with a cross-shaped head by a shaft sleeve and a cross-shaped head pin in a sheathing manner; the width sizes of the bearing sides of the connecting rod, the cross-shaped head and the shaft sleeve are respectively more than the width sizes of the non-bearing sides; the outer diameter of the cross-shaped head pin is a cylinder. The cross-shaped head mechanism disclosed by the invention has the advantages that the area of the stressing contact surface of the cross-shaped head and the cross-shaped head pin of the connecting rod is enlarged, the reaction force span and the bending stress of the cross-shaped head pin are reduced, the bearing capability of the shaft sleeve is improved, so that the size of the cross-shaped head is reduced and the shape size and the weight of the whole fracturing pump are reduced.