Abstract: The invention discloses a hair curler, including the first plate and second plate, the first plate is equipped with the first heater, and the second plate is equipped with the second heater. When the first plate and the second plate are in closed condition, there will be a reserved space of 0.06 mm to 0.12 mm between the first heater and the second heater. When the strand of hair is fewer between the first heater and the second heater in the use of the appliance, hold the plates until to nearly closed condition, considering there is a reserved space of 0.06 mm to 0.12 mm between the two heaters, while the dimension of human hair is about 0.08 mm, that means the strand of hair between the plates won't be grasped firmly. In this way, the clamping force caused when closing the plates will be greatly reduced, the hair will go smoothly through the reserved space without getting clamped off or damaged by the large clamping force.