People will be able to subscribe to popular channels such as Discovery and Eurosport individually, without paying for a bundle of channels.
Until now, Prime Video has offered only on-demand films and TV shows in the UK.
But one analyst said the launch line-up of channels was "not immediately desirable" and would struggle to attract satellite TV customers.
"Amazon launched a similar thing in the US, and the big selling point was that you could get HBO and Showtime programmes, all under one umbrella," said Tom Harrington, an analyst at Enders.