The utility model discloses an installation structure of a warping machine yarn bobbin. The installation structure comprises a rotating shaft, a first expansion block, a guide block, expansion pieces, an annular spring, a second expansion block and a tightening nut. The first expansion block and the second expansion block are in circular truncated cone shapes with circular cone faces; the guide block is provided with at least three grooves which extend in the axial direction of the rotating shaft and are evenly distributed in the circumferential direction of the rotating shaft; the expansion pieces are in plate-shaped cuboid shapes and are at least three in number, the expansion pieces are embedded in the grooves of the guide block in a sliding mode respectively, and each expansion piece abuts against the circular cone face of the first expansion block and the circular cone face of the second expansion block; a paper sleeve is composed of a cylindrical yarn bobbin and yarn. The installation structure further comprises a first baffle and a second baffle, the first baffle and the second baffle are arranged at the two ends of the yarn bobbin in the axial direction and are used for preventing the yarn on the yarn bobbin from collapsing on end faces, the first baffle is fixedly arranged on the first expansion block, and the second baffle is fixedly arranged at the outer end of the paper sleeve. Bristles are arranged on the inner side face of the first baffle and the inner side face of the second baffle. According to the installation structure, the yarn can be effectively prevented from collapsing on the end faces of the yarn bobbin in the yarn unwinding process.