The invention discloses an anti-slant patient transfer device, and belongs to the field of medical apparatus. The device comprises a vehicle body and wheels, and is characterized in that the device further comprises wheel stands, ratch strips, water grooves, floats, lead screws, and bevel gears; wheel shafts where the wheels are located are mounted at the lower ends of the wheel stands; ratch strips are arranged above the wheel stands; ratchets are arranged on the inner side faces of the ratch strips; horizontal pawls are arranged on the inner sides of the ratch strips; the water grooves are formed in the inner sides of the wheel stands, and the floats are arranged in the water grooves; the upper ends of the floats are inclined to the inner side; the wheel shafts where the wheels are located are fixedly connected with first bevel gears which are coaxial with the wheel shafts, second bevel gears which are meshed with the first bevel gears are arranged by the first bevel gears, the axes of the second bevel gears are vertical, and hollow shafts are fixedly connected to the upper portions of the second bevel gears; the lower ends of the lead screws are located in vertical holes of the hollow shafts; horizontal holes are formed in the upper ends of the ratch strips, and a horizontal bar penetrate through the horizontal holes. Compared with the prior art, the anti-slant patient transfer device has the characteristic of steady running.