Diners will be able to play games, use social media and browse the web using the devices.
The fast food giant said a trial of the tablets had proved ‘extremely popular’ with UK customers.
It is the chain's latest effort to update its image following the launch of table service and gourmet burgers in the UK last year.
McDonald's is also planning to offer wireless smartphone chargers and digital ordering at selected restaurants as part of its ‘Experience of the Future’ programme – the biggest investment and operational change in the chain’s 41-year history.
Doug Baker, head of IT restaurant solutions and service at McDonald’s UK, said: “Technology has an important role to play...in our customers’ eating out experience, so the changes we’re making as part of the ‘Experience of the Future’ programme bring us closer to the way people live their lives today.”
McDonald's has also refused to rule out serving alcohol or all-day breakfast in its UK stores.
The all-day Egg McMuffin was credited as turning around the company’s flagging fortunes in the USA last year, with sales rising 5.6 per cent in the last three months of 2015.
Tech firm SOTI - which partnered with McDonald’s to launch the tablets – said the decision highlighted an ‘increasing trend’ of retailers using technology to offer unique customer experiences.