The invention belongs to the technical field of agricultural machinery, and relates to a self-propelled soil flame steam machine for pest-killing and weed-killing. The machine comprises a vehicle body, a punching and wetting device, a high-temperature device for pest-killing and weed-killing, and an intelligent probe device; the punching and wetting device comprises a water tank (12), a water pipe(13), a fixed tank (16) and a punching device; the high-temperature device for pest-killing and weed-killing comprises a fire gun sliding rail plate (4), a fire gun nozzle (5), a fire gun sliding rail (6), a fire gun sliding rod (7), a fire gun support rod (8), a gas conveying pipe (9), a fire gun fixing plate (10), a gas storage tank (11), a fire gun top plug (22) and a spark plug (23); and theintelligent probe device comprises a signal processing component (14) and a probe (15). Flame and high-temperature steam are utilized to kill pests and weeds in soil, so that pest-killing and weed-killing are more thorough, especially the effect of pest-killing and weed-killing in deep soil is greatly improved, the problem of environmental pollution caused by the use of chemical pesticides is alsosolved, and the object of improving the environment is achieved.