Suspects were slapped, kicked, hit with shoes or bottles filled with water, denied sleep and locked in chairs forcing them into painful postures for hours on end, the rights group said.
The report comes a week before China's record is set to be scrutinised by the United Nations' anti-torture committee in Geneva.
It cited official data as saying that China's top prosecutorial body received at least 1,321 reports of extracting confession through torture from 2008 to the first half of 2015.
"For the police, obtaining a confession is still the easiest way to secure a conviction," said Amnesty researcher Patrick Poon.
"The government seems more concerned about the potential embarrassment wrongful convictions can cause than about curbing torture in detention," he added.
Some lawyers representing activists or members of banned religious groups have themselves ended up being tortured, Amnesty said.
Of the 37 lawyers the group interviewed, 10 experienced torture or other ill-treatment themselves in incidents dating back to 2010.
Beijing lawyer Yu Wensheng said his wrists were shackled behind his back with painfully tight handcuffs during a near 100-day detention in 2014.
Courts regularly admit evidence which has allegedly been extracted by torture, the group said, citing a sample of 590 cases in which allegations of torture were made -- with the "confessions" excluded in just 16 cases.
China says it is taking measures to reduce the prevalence of forced confessions, including installing cameras in interrogation rooms and adopting laws banning the practice.
Chinese officials often say that Amnesty is "biased" against them.
"Local officials and police continue to pull the strings of China's criminal justice system. Despite defence lawyers' best efforts, many claims of torture are simply ignored," Poon said.
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