The invention discloses a treatment technology for a fastening screw for a deep sea oil well support. The treatment technology comprises the following specific steps that firstly, blanking is conducted, a cylinder blank is selected, and the blank comprises components including, by mass percent, 0.05%-0.06% of C, 0.5%-1% of Mn, 0.5%-0.8% of Ni, 2%-4% of Cr, 0.4%-0.6% of Nb, 0.1%-0.2% of blank Si, 0.1%-0.12% of N, 0.2%-0.5% of Fe, 1.5%-2.0% of Mg, smaller than or equal to 0.2% of Cu, smaller than or equal to 0.015% of s, smaller than or equal to 0.025% of p, 0.3%-0.5% of Mo, 2%-4% of Al, 0.3%-0.5% of Ti, 0.02%-0.03% of B, 0.0018%-0.0022% of v, 0.1%-0.3% of composite rare earth, 0.2%-0.4% of rare earth elements and the balance Al; and the composite rare earth comprises components including, by weight percent, 13%-15% of cerium, 15%-18% of praseodymium, 5%-8% of holmium, 8%-10% of gadolinium, 8%-10% of yttrium and the balance lanthanum, and the sum of the components of the above compositerare earth is 100%.