"The suspect turned himself in at the Gera police station shortly before 9 am and was arrested there without resistance," police in the eastern city said.
The man, who was not named, is accused of dousing his wife with a flammable liquid and setting fire to her inside a tram in Gera on Sunday, causing her life-threatening injuries.
"She was sprayed with flammable liquid and set alight by a man," police said after the attack, adding later that the suspect was believed to be the victim's husband.
Police had published a photo of the alleged suspect, a 46-year-old man with Georgian roots, as well as a description of the clothes he was wearing at the time of the attack.
The tram driver used a fire extinguisher to put out the flames but the woman, also 46, had already sustained life-threatening injuries and was taken by helicopter to hospital.
When other passengers pressed the emergency stop button, the perpetrator took advantage of the doors opening to flee.
Police had launched a search for the suspect on suspicion of attempted murder.
On Monday morning, before the suspect turned himself in, the investigation was ongoing and the police had appealed for witnesses to contact them.
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