Noroozi, 26, controlled the 60kg fight throughout as European champion Lashkhi struggled to get a hold in the contest. A strong defence won the Iranian the first period while a well-executed pin in the second sealed the victory.
Hamid Mohammad Soryan Reihanpour had won Iran's first ever Olympic gold in the sport on Sunday in the 55kg group.
Noroozi fought in obvious discomfort, wearing heavy strapping to his right shoulder and wrestling through the pain for the gold medal.
In front of a noisy Iranian support inside ExCeL Arena, the physically smaller Noroozi was able to comprehensively protect himself from attack while launching enough well-timed assaults to triumph in the contest.
Ryutaro Matsumoto of Japan and Russia's Zaur Kuramagomedov won the two bronzes on offer.
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