Sharapova, who had needed three sets in all her previous rounds in Stuttgart, found it easier against Li, with her serve setting her up for her second consecutive victory in the indoor arena.
The top seed, her loud grunts echoing around the stadium, snatched a break at the start, with a sizzling backhand down the line that left Li stranded.
Li sent a crosscourt backhand into the net to give the Russian another break and allow her to go 4-1 up.
The Australian Open finalist bounced back in the next game and grabbed her own first break when Sharapova sent a forehand long after a long rally.
Sharapova was in no mood for adventures, however, and quickly established a double break cushion, then served out the first set on her first opportunity when Li sank a return into the net after another well-placed serve.
The pair traded blows until Sharapova earned another break point and went 4-3 up.
With a superb first-serve figure of 76 percent throughout the game, she kept her opponent pinned to the back and earned her second title of the year when Li double-faulted on the first match point.
In the day's other WTA final in Marrakech, sixth seed Francesca Schiavone claimed her sixth career title as she beat Lourdes Dominguez Lino 6-1 6-3 to win the Grand Prix de SAR La Princesse Lalla.
The match was closer than the scoreline suggested, but Italian star Schiavone was utterly ruthless taking her chances, converting two out of her three break points in the first set and saving three out of the four break points against her in the second while breaking her opponent three times.
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