Commonwealth Games star Dixon claimed the men’s platform and three-metre titles on Sunday at the Life Centre.
There was also title success for fellow Commonwealth Games competitor Victoria Vincent, European Games finalist Shanice Lobb, Kayleigh Sinclair and Aidan Heslop, while a number of other Plymouth divers won medals.
Dixon was well ahead of his rivals in both his finals on Sunday.
He scored 210.50 to win the platform event, with fellow Plymouth diver Owen Weymouth fifth with 126.85.
Dixon, who was part of the Great Britain team at last summer’s inaugural European Games in Baku, scored 182.10 in the three-metre springboard event. His Plymouth team-mate Alex Kostov took silver with 172.20, while Weymouth was fifth with 128.20.
Weymouth did win a medal in the high board event, taking second behind Plymouth team-mate Aidan Heslop, who triumphed with 133.50. Plymouth Diving’s Iris Schmidbauer was third in the high board and first female.
Vincent, who competed at the 2014 Commonwealth Games at the age of just 13, triumphed in the girls’ B platform final. She scored 203.00 points to beat her Plymouth team-mate Cody Powell-Tuckett to the title. Powell-Tuckett scored 178.55 to take silver.
Lobb was miles ahead of anyone else in the women’s platform final. She scored 189.60, which was more than 71 points ahead of the next best diver, which was Charlotte West of Albatross. Schmidbauer just missed out on a medal in fourth.
Sinclair triumphed in the women’s three-metre event with 169.15 points.
Plymouth Diving took silver and bronze in the girls’ E/D one-metre event. Evangeline Piper (110.70) finished second behind Southend’s Jessie Milham (113.40), with Summer Radcliffe third with 105.20 points.
There was also a silver medal for Euan McCabe in the boys’ E/D five-metre event, while Zach Anderson was fourth.
High dive champion Heslop also won bronze in the boys’ B one-metre final.
The Armada Cup continues at the Life Centre until Tuesday afternoon.