The invention relates to a high-strength polyarylether ester composite and a preparation method thereof. The high-strength polyarylether ester composite is prepared from 10-60% of polyarylether ester, 10-60% of filling reinforcer, 0.3-15% of liquid crystal high polymer, 0.1-8.0% of epoxy resin and 0.1-7.0% of other assistants. The preparation method comprises the following steps: mixing the components at 200-300 DEG C in a double screw extruder, wherein liquid crystal high polymer and nucleating agent of the other assistants are added in a side-feeding weight-loss metering mode and the filling reinforcer is added in a side-feeding weight-loss mode; and discharging materials, cooling, and granulating. Compared with the prior art, on the premise of giving consideration to low mold temperature, the preparation method provided by the invention is used to greatly enhance the strength of the material, has the advantages of simple preparation technique, low raw material cost, beautiful product appearance and the like, and has good market prospects.