He said Theresa May had “made the mistake of prioritising a ‘deal’ with the unelected EU representatives, which they have little incentive to accommodate, rather than a sensible implementation of Brexit in areas under the control of parliament”.
He said that fishing rights and financial contributions need no agreement from a third party.
Wetherspoon plans to continue dropping European beers and wines for English and US options.
Sales over the past 10 weeks are up 5.6 per cent.
Shares rose 43p to 1287p.
Mr Martin said: “Ninety-nine percent of the benefits of leaving the EU including the avoidance of vast financial contributions, the elimination of tariffs and the reacquisition of fishing rights, need no agreement from any third party.
“The prime minister can avoid most current problems by prioritising these areas.
“We are frequently asked about the effect of Brexit on the company and the economy.
“The main advantage of Brexit is that the EU is a protectionist system that imposes high tariffs on non-EU imports such as wine, rice, coffee, oranges, children’s shoes and clothes, and over 12,000 other products.
“Leaving the EU allows the UK to adopt the approach of countries like Singapore, Hong Kong, Switzerland and Australia by dismantling these tariff walls, which improves general living standards.”
The company said: “As in the current year, we anticipate considerable cost increases next year, in areas including business rates, the sugar tax, utility taxes and wages.”
Mr Martin said. “In addition, as a result of an increase in our ‘swaps’, our interest rates will rise by around £7m.”