The invention discloses a combined gear oil stirring experiment device, which comprises a box body, a box cover arranged on the box body, bearing seats arranged on both sides of the box body, and a spline ladder fixed on the bearing seats through bearings at both ends shaft, a splined disk is fixed on the splined stepped shaft, and a splined gear assembly or a splined wheel assembly is set outside the splined disk; the splined gear assembly includes at least one external gear ring, when the external gear ring When the number is ≥ two, an inner gear ring is fitted between two adjacent outer gear rings; the spline wheel assembly includes at least one pair of outer gear rings and inner gear rings, and the outer gear rings and inner gear rings are sequentially arranged from inside to outside Arranged at intervals; at the same time, one end of the splined stepped shaft is connected to the speed torque sensor 1 and the drive motor, and the other end of the splined stepped shaft is connected to the speed torque sensor 2 and the dynamometer motor; the advantage of the present invention is that it is easy to install and replace Gears or discs with different diameters, modulus, and number of teeth can achieve accurate axial displacement positioning.