The invention discloses a flame cutting robot. The flame cutting robot comprises a first mounting base and a second mounting base which are oppositely arranged, wherein a mounting block used for mounting a flame cutting mechanical arm is arranged between the first mounting base and the second mounting base, and telescopic assemblies are arranged on the first mounting base and the second mounting base and used for driving the mounting block to be away from or close to the first mounting base and the second mounting base. A first driving assembly used for driving the telescopic assemblies to move is arranged on the first mounting base and comprises a transmission chain driven by the servo motor. During use, the length of the arranged telescopic assemblies can be freely adjusted, and when workpieces are furthermore cut, the telescopic assemblies can be correspondingly adjusted according to the sizes of the workpieces to be more suitable for cutting on the workpieces with different sizes,the space occupied by the telescopic assemblies can be greatly lowered after the telescopic assemblies are retracted, and then conveying and carrying can be more convenient.