The invention relates to a chain type double-side heating grill machine and a working method thereof. The machine comprises a machine base, wherein a conveying device, a front heating device and a back heating device are arranged on the base; the front heating device is arranged in the conveying device; the base, the front heating device and the rear heating device form a grill chamber; the conveying device comprises a driving device, a driving shaft, a driving wheel, a driven shaft, a driven wheel and a net belt shaped like a Chinese character 'Yi', wherein the driving device is arranged on the base, the driving shaft is arranged on the base, the driving wheel is arranged on the driving shaft; the driven shaft is arranged on the base, the driven wheel is arranged on the driven shaft, thenet belt shaped like the Chinese character 'Yi' is sleeved between the driving wheel and the driven wheel, the food hung on the net belt shaped like the Chinese character 'Yi' can move circularly along the driving wheel and the driven wheel, after being heated for a period, the food enters the grill chamber, then, the food can be subjected to oil brushing and flavor brushing, the treated food enters the grill chamber again, the food can be cooked gradually. The color, fragrance and taste can be ensured; the invention also discloses a working method of the chain type double-sided heating grillmachine.