The invention discloses a turnout beam drive device of a straddle type monorail turnout and the straddle type monorail turnout. The turnout beam drive device comprises a guide rod and a rotary drive component, wherein one end of the guide rod is rotationally fixed to the ground, and a thread is arranged on the guide rod; the rotary drive component is rotationally connected to the position below aturnout beam and comprises a drive motor and a first gear, the first gear is in thread fit with the guide rod and is in transmission with the drive motor, and therefore the guide rod is driven by thedrive motor through the first gear to rotate around the fixed end of the guide rod. Through arrangement of the first gear and the guide rod, the turnout beam can be driven to move in a thread drive mode, and vibration and noise of the whole turnout beam in the operation process can be effectively reduced in the mode. In addition, the occupied ground space of the turnout beam drive device can be reduced as well, and the arrangement reasonability and reliability of the turnout beam drive device can be improved.