Daley famously won gold as a 15-year-old at the 2009 event in Rome.
Although he has since gone on to win European, Commonwealth, World Series and World Junior gold medals and an Olympic bronze, he has not claimed another World Championship gong.
That is something he is hoping to put right in Russia over the next 10 days.
“The gold medal is always the main aim for me, no matter what competition,” he said.
“This time of year and with the Olympics next year – a medal would be amazing.
“So that is the main aim and always will be, it would be great to get back on the World Championship podium, especially heading into next year’s Games.”
Daley, who is joined in Kazan by fellow Plymothians Tonia Couch and Sarah Barrow, believes British diving has never been stronger.
“It is exciting going into a competition now where other countries are looking at us for a change,” he said.
Daley’s individual event, the 10m platform, will not take place until August 1 and 2.
Couch and Barrow will be in action in the women’s synchro on Monday, while their individual heats and semis will take place on Wednesday.