The invention relates to a method for preventing and curing vegetable soil continuous cropping obstacle by crop straw, comprising the following operating steps: 1, after vegetable is harvested, plowing soil; 2, spreading one layer of dry crop straws on plowed soil, wherein straw use level is characterized in that 80-150 kg of crop straws are spread on the soil with the area of 5m<2>; 3, covering soil near the periphery plough layer out of soil spread with the straws on the straws, and causing straws in the periphery to expose outwards; 4, igniting straws which expose outwards to burn the straws; and 5, cleaning soil from the position 15 cm below the straw until upper unburned straws expose, which is favorable for straws to continue burning, and carrying out circulation operation until allstraws are burnt up. The method provided by the invention has obvious production increase effect on new and old vegetable plots and especially has obvious effect on improving old vegetable plots. Because the invention disinfects soil to cause degraded soil to restore health, the method in the invention also has obvious effect on improving non-vegetable soil continuous cropping soil.