Tesco's brand value has declined by 37% to $9.4m as customers turn towards smaller discount stores.
The latest BrandZ ranking from WPP and Millward Brown shows that Aldi's brand has risen 22% to $11.7m, while Lidl's increased by 27% to $6m.
Recent figures now put Aldi as the sixth biggest supermarket retailer in the UK, with the market share of the big four retailers - Tesco, Waitrose, Sainsburys and Asda - now at 72.8%, its lowest level in a decade.
Tesco dropped more than any other company in the top 20 retailers, with companies in that category growing 24% overall.