The invention discloses a device for thermally bending a titanium alloy sheet into a profile and a thermal bending method thereof. The device includes an upper fixing block, a pressing block, a lower machine body, a bending upper fixing block, a bending block, a pressing hydraulic cylinder and Main bending hydraulic cylinder. First, the clamping device clamps the titanium alloy plate, and then heats the central area of the plate through the flame heating pipe. After reaching a certain temperature, the whole plate is quickly transported to the first wear-resistant plate, and the pressing block moves downward until the second The three wear-resistant plates are fixed in contact with the upper part of the plate. At the same time, the heating wires in the first heating hole and the second heating hole keep the plate warm to reduce heat loss. The bending block moves downward to bend the whole plate, and finally The clamping device clamps the heated sheet and transports the sheet away. This device can solve the demand for short-time conversion from heating to bending of the hot bending process of titanium alloy plates, reduce heat dissipation time, provide bending consistency and uniformity, and meet the needs of high-precision titanium alloy V-shaped profiles.