The invention relates to a polymer multilevel pulling-grinding device. The device is characterized in that: the device comprises a shell vertically fixed on a bracket, the inside of the shell is provided with a pulling-grinding mechanism comprising a grinding disc and a rotary shaft axially penetrating the shell; the grinding disc, from wideness to thinness and from bigness to smallness, comprises at least two levels; each level of grinding disc comprises a rotor and a stator which are coaxially arranged on the rotary shaft, the rotor is fixedly connected with the rotary shaft, the stator is fixedly connected with the shell and movably connected with the rotary shaft by sealing disc packers circumferentially arranged respectively; a plurality of oblique flow passages which is from top to bottom are evenly arranged around the centers of the rotor and the stator of each level of grinding disc; each level of grinding disc is communicated with a material discharging pipe; the upper and the lower ends of the rotary shaft are fixed on the shell by gears respectively; the upper part of the rotary shaft is hollow and forms a material charging pipe; and the upper end of the rotary shaft is provided with a gear connected with an input end of a motor by a gear transmission device. The device has the advantages of having compact structure, reducing equipment volume, saving space, and being widely applied to the polymer flooding operation in offshore oil exploitation.