The invention relates to the technical field of force measurement, especially a straw pulling force tester. The tester comprises a vertical maintaining mechanism, a clamping mechanism, a lifting mechanism, and a support. The vertical maintaining mechanism comprises a workbench, a spherical sleeve, and a compression device. The spherical sleeve is disposed at the center of the workbench, and is located in the workbench. The bottom of the spherical sleeve is fixedly provided with a rectangular projection, and the interior of the inner cavity of the spherical sleeve is provided with a lifting mechanism. The external surface of the spherical sleeve is spherical, and cooperates with the workbench. The spherical sleeve rotates in the workbench, and enables the lifting mechanism and the clamping mechanism to remain vertical under the action of gravity. One end of the compression device is spherical, and contacts with the spherical sleeve. The lifting mechanism comprises a pulling hand wheel, a threaded sleeve, a pulling rod, and a strain-type pulling force sensor. The center of the pulling rod is provided with a cavity, and the bottom of the pulling rod is fixedly connected with the clamping mechanism. The tester is simple in structure, is convenient to operate, and can precisely measure the pulling force of straw.