The invention discloses a hot forming method and a hot forming mould. The hot forming method includes providing the hot forming mould which is provided at least with a first portion and a second portion long the horizontal direction; guiding a heated austenitized steel plate into the hot forming mould to be subjected to forming process; cooling the first portion of the hot forming mould at a first cooling rate and cooling the second portion of the hot forming mould at a second cooling rate, wherein the first cooling rate is different from the second cooling rate, accordingly, an integrally formed component with changed transverse strength is formed in the hot forming mould. The structure of the hot forming mould is simple, components with diversified originations and different strength distribution can be obtained through simple process, performances of different positions of the components can have great differences, so that requirements of different occasions can be satisfied. Due to the hot forming method, not only the design space of steel plate materials can be improved, but also parameter setting is simplified, and the production cost is reduced.