The 32-year-old has been in the form of his life this month, his 51 from 69 balls on a challenging surface at the Hampshire Bowl the fifth time in six tournament innings he has surpassed a half-century.
Mushfiqur Rahim top-scored with 83 in Bangladesh's 262 for seven before Shakib took centre stage once more, becoming the first bowler from his country to take a five-wicket World Cup haul.
His five for 29, the best figures of the tournament so far, saw Afghanistan subside to 200 all out after 47 overs for their seventh successive defeat.
Tweet of the day
The Ashes 2005 winning captain has butterflies ahead of England v Australia at Lord's on Tuesday.
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The England captain insists disgraced Australian pair David Warner and Steve Smith cannot expect immediate forgiveness despite completing 12-month suspensions for their roles in last year's ball-tampering controversy.
Shakib is in an otherworldly run of form at present. Most of the deserved praise coming his way has been because of his work with the bat following scores of 75, 64, 121, 124, 41 and 51, the last one taking him back to the top of the run-scoring charts. On the day he became the first Bangladesh batsman to reach 1,000 World Cup runs, 476 of which have come this month, he became the first Tigers bowler to take a five-wicket haul in the competition to heavily undermine Afghanistan's chase.
Mushfiqur held Bangladesh's innings together, primarily through his diligence between the wickets in an innings containing few boundaries. However, with Mahmudullah hobbling because of an injury to his right calf, Mushfiqur decided to attack, stepping down the pitch and butchering Dawlat Zadran over long-on. The only six of Bangladesh's innings took Mushfiqur to a 56-ball half-century. He went on to follow up his unbeaten century against Australia last week with an impressive 83 off 87 balls on the south coast.
Mujeeb Ur Rahman's carrom balls to see the back of Shakib and Soumya Sarkar, both of whom were trapped in front, deserve honourable mentions but Shakib's delivery to Afghanistan dangerman Mohammad Nabi scoops this honour. Nabi's half-century had guided Afghanistan to within 12 runs of beating India so his threat was obvious. He lasted just two balls here, though, castled via an inside edge by one that skidded on.
June 25: England v Australia at Lord's.