The utility model discloses a steam jet drill bit, including 3 -wing bit, multistage steam generator, steam jet, high -frequency heating ware, drilling rod etc. Carrying out the bleeding to high -pressure water jet through multistage steam generator, making it change high -pressure steam jet into, 3 -wing bit goes up the high -frequency heating ware that sets up and can make the steam jet keep high temperature state and stable saturation steam pressure simultaneously. Compare in high -pressure water jet technique, the steam jet technique is the detritus in the emptying hole better, high -pressure steam jet can get into the gap of boring between sword and the rock simultaneously to producing the protection effect of similar aircushion vehicle, improving drilling speed, the protection drill bit makes tool joint more stable.