The jet – AKA J-31 – has a top speed of Mach 1.8, stealth coating and is armed with 4 radar-guided air-to-air missiles.
Manufacturer the Shenyang Aircraft Corporation has bragged it could "take down" the F-35 in head-to-head combat.
Lin Zuoming, president of Aviation Industry Corp of China, said: “When it takes to the sky, it could definitely take down the F-35. It's a certainty.”
The FC-31 would be the first stealth fighter available to countries who face US export restrictions or cannot afford Lockheed Martin's £85million F-35.
It is expected to ready for combat in 2022.