The invention discloses an 825/X70 nickel-based alloy clad plate and a production method thereof. A composite blank for preparing the clad plate includes an X70 low alloy steel base material and an 825 alloy composite; the lengths and widths of the base material and composite are the same, the lengths are 2-4 m, the widths are 1-3 m, and the thickness ratio is 3-10; machining can be performed on the to-be-composited surfaces of the composite and base material, the composite blank can be formed through successive stacking according to the sequence of the base material, the composite, the composite and the base material, a release agent can be sprayed between the two composites, and vacuum electron beam seal welding can be performed on the composite blank after vacuum pumping; the welded composite blank can be heated to 1,200-1,250 DEG C to perform heat preservation, an initial rolling temperature is 1,180-1,200 DEG C, a single pass reduction rate is greater than or equal to 15%, and thefirst three pass reduction rates are greater than or equal to 20%, and the total reduction rate is greater than or equal to 80%. The produced clad plate of 5-32 mm has excellent corrosion resistance,and suitable for requirements for high corrosion resistance and simultaneously considering the pipeline manufacturing of whole structure mechanical properties.