The utility model provides a controllable incendiary bomb of temperature gradient, including front end housing (13), incendiary bomb body (2), rear end cap (1), electric heating wire (7), burning chamber (8), forced air cooling chamber (6), inlet port (14), exhaust hole (3), inlet port (12), glow plug (18), cooling air import (5), cooling air export (11) temperature sensor (10), pressure sensor constitutions such as (15). Incendiary bomb body plus the electric heating wire who is equipped with the pitch change heat the incendiary bomb, change heater strip thermal current density through adjusting heating power, and the ventilation air of by freezing intracavity is to cooling off the burning body, the glow plug is through heating the combustible gas mixture body in the bullet to the sudden change of pressure sensor registration is for maring constantly, and the interior temperature sensor's of heating this moment stopper measured value is flammable limits of temperature promptly, finally realizes the constant volume bomb that temperature gradient is controllable.