The 24% increase in the past year reflects the growing popularity of craft beer and "boutique" food and drink products.
Accountancy group UHY Hacker Young said its research showed a slight fall in new breweries in the rest of England, but increases in other parts of the UK.
James Simmonds of UHY Hacker Young said: "Craft beer has quickly become the drink of choice for pub-goers, especially in London which has cemented its position at the centre of the UK's craft beer industry.
"It's not surprising that London has such a large amount of new microbreweries, with the high numbers of young professionals working within the city.
"Because craft beer is viewed as a luxury good, customers are prepared to pay a higher price in comparison to other more commercially branded beers."
Our BQ Bulletin emails will land in your inbox at 7.30am, Monday to Friday, with a mix of the latest local business news, national news, and features to inspire you. Sign up here!
Click here to read our privacy statement