The invention discloses a thermoforming and quenching integrated forming method. The thermoforming and quenching integrated forming method is used for machining and forming an alloy plate. The methodcomprises the steps of 1, mounting a forming die onto hot pressing forming equipment, and heating the forming die to the quenching temperature; 2, after the plate is heated to the quenching temperature in a heating furnace, taking the plate out, and fixing the plate into a cavity of a lower die; 3,starting the hot pressing forming equipment, in the process that thermoforming is conducted on the plate when the forming die is gradually closed, cooling the forming die and the plate through a cooling device, and controlling the temperature of the plate to be lowered to complete quenching, so thatthermoforming is completed after the forming die is closed completely; and 4, conducting aging treatment on the formed plate. According to the thermoforming and quenching integrated forming method, quenching is immediately conducted on the alloy plate after thermoforming; fine grain structures are preserved at the high temperature while work hardening is conducted, and material strength is effectively guaranteed; the quenching process is implemented in the die cavity, and it is effectively guaranteed that a formed part does not deform due to thermal stress; and forming precision is high.