Mitch Winehouse says the producers left out key details.
He says the film is unbalanced, and isn’t happy with the way he’s portrayed.
Amy is due to be shown at this year’s Cannes Film Festival.
The documentary was made by the same team behind the BAFTA-winning documentary Senna, about the Formula 1 racing driver Ayrton Senna.
Mitch Winehouse, who now fronts the Amy Winehouse Foundation, says the film presents him as not being there to help Amy, something he denies.
His comments come as a spokesperson for Amy Winehouse’s family said they “would like to disassociate themselves from the forthcoming film about their much missed and beloved Amy”.
The filmmakers have defended the documentary saying: “When we were approached to make the film, we came on board with the full backing of the Winehouse family and we approached the project with total objectivity, as with Senna.
“During the production process, we conducted in the region of 100 interviews with people that knew Amy Winehouse; friends, family, former-partners and members of the music industry that worked with her.
“The story that the film tells is a reflection of our findings from these interviews.”
Amy Winehouse died at the age of 27 from alcohol poisoning in July 2011.
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