"Hezbollah is continuing in its attempts to destabilise the fragile situation in the Middle East," Home Secretary Sajid Javid said in a statement.
"We are no longer able to distinguish between their already banned military wing and the political party. Because of this, I have taken the decision to proscribe the group in its entirety," he said.
The ban is subject to a vote in parliament this week.
Hezbollah is a Shiite militant movement established in 1982 during the Lebanese civil war.
Its capture of two Israeli soldiers in 2006 sparked a 34-day war in which 1,200 people were killed.
Israel welcomed the move, with Foreign Minister Israel Katz saying: "In my upcoming meeting with the UN secretary-general in New York next week I will stress that the UN institutions should take a similar resolution."
The movement, now a major political party in Lebanon, holds three cabinet posts.
"It is clear the distinction between Hezbollah's military and political wings does not exist," Foreign Secretary Jeremy Hunt said in Monday's statement.
"This does not change our ongoing commitment to Lebanon, with whom we have a broad and strong relationship," he said.
The government is also banning Ansarul Islam, a jihadist group which emerged near the border between Mali and Burkina Faso in 2016, and the Group to Support Islam and Muslims (JNIM), which has sworn allegiance to Al-Qaeda in the Islamic Maghreb.
Britain currently has 74 international terrorist organisations proscribed under the Terrorism Act 2000. AFP
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