The 40-year-old father – who cannot be named to protect the identity of his son – was unanimously convicted by a jury after nine hours of deliberations at Worcester Crown Court.
The dad was convicted alongside five others who were found guilty of conspiracy to apply corrosive fluid with intent.
Adam Cech, Jan Dudi, Norbert Pulko, Jabar Paktia, and Saied Hussini were convicted of plotting to spray sulphuric acid on the boy with intent to harm.
Deliberations are continuing for Martina Badiova, on trial alongside the men, who is facing the same charge.
The six-week trial was told that the youngster suffered serious injuries to his face and arm at a Home Bargains store in the city.
After the attack at a Home Bargains store the victim screamed “I hurt” over and over again, jurors heard.
The heartbroken mum was heard screaming: “What have you done to my baby?”
The Crown alleged that the dad, stung by his wife walking out on him in 2016, enlisted others to attack his son in a bid to win more contact with the child by showing that his mother was unfit to care for him.
Jurors deliberated for nine hours before convicting the dad, from Wolverhampton but originally from Afghanistan, on Wednesday.
The boy has since made a “good recovery” and is living with his mother.
Nick Carson, from West Midlands Ambulance Service, who treated the little boy, said at the time of the attack: “It’s horrific, absolutely horrific.
“We had no inkling or any reason to suspect it was an acid attack.
“We just thought that maybe he had come into contact with some sort of chemical. But to find out afterwards that that was the case, it’s shocking.
“The fluid that I saw was pink in colour. It had quite a strong smell. No bleach or acidy type smell but it was an astringent kind of smell. Just smelt like a chemical really.”