The invention discloses a hair straightener with a heating plate capable of elastically bending and deforming, which comprises a shell, a power line assembly, a heating plate assembly, a control switch and a circuit board, the heating plate assembly comprises the heating plate and a heater, the heater is horizontally arranged on a plurality of support blocks, and the support blocks are arranged on a fixed frame through support legs at two ends; an elastic rubber base is arranged in the fixing frame, and the supporting block is arranged above the elastic rubber base. A plurality of U-shaped supports are laid on the heater, and the heating plates are laid on the U-shaped supports. By designing the supporting structure mainly comprising the U-shaped support, the supporting block and the elastic rubber base, the heating plate and the heater are installed and fixed through the supporting structure, the heating plate can generate local elastic bending deformation in the hair pulling direction during hair pulling, and therefore the situation that due to the fact that clamping pressure is too large, hair is clamped, hair pulling is not smooth, and a pulling pain feeling is generated is avoided; meanwhile, the heating plate can better wrap the hair, so that heat energy is more uniform and effectively and directly transmitted to the hair, and the hair pulling effect and experience are improved.