A climber known as the French Spider-Man has scaled a skyscraper owned by Hong Kong’s richest man to unveil a banner which appears to be related to anti-government protests in the city.

Alain Robert, 56, climbed the Cheung Kong Center, owned by billionaire Li Ka-Shing, on Friday before hanging a banner with the Hong Kong and China flags above a handshake.

The Frenchman has gained notoriety from scaling skyscrapers around the world, often without safety equipment.

Almost exactly a year ago, he was given a ban from climbing in Hong Kong. At the time, he joked he would be back on day 366.

In 2011, Robert climbed Hong Kong’s 27-floor Hang Seng Bank building using just his hands, to raise awareness of global warming.

Robert’s feat follows adverts taken out by billionaire Li in a local newspaper on Friday that said “Love Hong Kong, love China, love yourself”.

‘The melon of Huangtai’: tycoon Li Ka-shing’s poetic call to restore order

Hong Kong is in the midst of protests against a now-shelved extradition bill that would have allowed transfers of fugitives to all jurisdictions that the city is yet to sign an extradition deal with, including mainland China.

The demonstrations have escalated into 11 weeks of violent clashes between protesters and police.

In a video of Robert scaling the building, a man said: “That’s crazy” and his friend replied: “That’s nuts.”

Robert’s other climbs include the Burj Khalifa in Dubai, the Eiffel Tower, the Sydney Opera House, the Petronas Twin Towers in Kuala Lumpur and the Galaxy Macau tower.

Robert is led to a police car after being detained following his climb of the 47-storey GT Tower in Manila in January. Photo: AFP