The invention discloses a large-size metallic glass composite material with tensile ductility and a preparation method thereof. A composition expression of the metallic glass composite material is ZraTibMcCudNieBef (atom percent), wherein M is one of Nb, V or Hf, a is not less than 10 and not more than 70, b is not less than 10 and not more than 70, c is not less than 4 and not more than 20, d isnot less than 2 and not more than 20, e is not less than 0 and not more than 15, f is not less than 5 and not more than 22.5, and a+b+c+d+e+f is equal to 100. The preparation method is called after semi-solid progressive solidification method, which comprises the following steps of: smelting master alloy ingots and casting into master alloy profiles; putting the master alloy profiles into a crucible and heating until the profiles are completely melted, and performing the overheating processing to dissolve impurity phases; reducing the temperature to a solid-liquid two-phase region; performingsemi-solid processing, and controlling the shape and the size of a precipitated solid solution phase; and then performing the semi-solid progressive solidification to form the large-size metallic glass composite material with tensile ductility. By adopting the method, the homogeneous and defect-free large-size (30 mm) metallic glass composite material is prepared, and the composite material has remarkable work hardening capacity and excellent tensile strength and ductility.