The invention discloses a straddle-type monorail system. The straddle-type monorail system comprises a beam body and a bogie, the beam body comprises a top plate, a web and a bottom plate, the bogie comprises a framework, traction transmission devices, a braking device, traveling wheels and guiding stabilizing wheels, both the traveling wheels and the guiding stabilizing wheels are connected to the framework, the traction transmission devices and the braking device are connected to the traveling wheels correspondingly, the top face of the top plate serves as the traveling faces of the traveling wheels, chamfers with arc-shaped faces are arranged on the two side faces of both the top plate and the web, the arc-shaped faces serve as the guiding stabilizing faces for allowing the guiding stabilizing wheels to travel, the two guiding stabilizing faces on the two sides are oppositely arranged, and each guiding stabilizing wheel is arranged in the direction perpendicular to the tangential direction of the preset contact position on the corresponding guiding stabilizing face. By adopting the straddle-type monorail system, wheel abrasion can be reduced, stress concentration at the variablecross-section of the beam body is avoided, flexibility of rail path planning is improved, the production and construction costs are lowered, and lightweight design of the rail system is facilitated.