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Pictures taken of the town centre show large anti-terror gates have been installed, which are designed to prevent vehicle ramming attacks.
The royal borough has been earmarked for a £2.4 million fund to prevent “hostile vehicle mitigation” along with a further £1.3 million for CCTV upgrades in the 2018/19 budget.
The ginger royal is due to marry the stunning ex-Suits star, 36, at Windsor Castle in May after proposing last year.
Shortly after Harry got down on one knee, intelligence sources revealed the couple is at the top of the Islamist group’s “kill list”.
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Prince IN Wales: Meghan Markle and Prince Harry visit Cardiff
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“We know that at this very moment terrorists are plotting attacks against the Royal family”
Security source
SAS troopers and MI5 intelligence analysts are reportedly working full-time to protect the duo as they gear up to tie the knot.
Members of the team have shoot to kill clearance and are trained in emergency first aid if either Harry or Meghan were injured.
An intelligence source said previously: “We know that at this very moment terrorists are plotting attacks against the Royal family.
“Meghan and Harry are the most high-profile members of that group.”
When Royals go ROGUE: the moments that left the monarchy red faced
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But ISIS aren’t the only group that has vowed to terrorise the couple’s special day.
UK-based anarchists have posted violent and bizarre poetry online threatening to make “blood run blue” in Windsor.
The thinly-veiled threat of violence posted by one class war activist said: “Hark Hark! We’re all coming own to Windsor to throw some things at you, but it ain’t no confetti, so let the blood run blue.
“We hear the ringing bells, we’d rather wring your necks. We burned down Hampton Court, now Windsor Castle’s next.”