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Strong ${\\rm H}_2$ absorption was detected, with a total ${\\rm H}_2$ column density of $N({\\rm H}_2)=(4.45\\pm 0.36)\\times 10^{19} {\\rm cm^{-2}}$.The molecular hydrogen fraction is $f_{{\\rm H}_2}=\\frac{2N_{\\rm H_2}}{N_{\\rm HI}+2N_{\\rm H_2}}=(5.6\\pm 0.7)%$, which is the greatest value reported so far in any redshifted damped Ly$\\alpha$ system. 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