The utility model provides a carburization quenching frock of bent axle, includes flat board and stand, and the flat board has upper surface, lower surface and a plurality of carburization quenching unit, and the through -hole lies in the center of carburization quenching unit, and the centre of a circle and 3 macroporous centres of a circle in bent axle location of 3 bent axle location apertures interlock equipartitions on the use R of carburization quenching unit is radial same circumference, the diameter of bent axle location aperture is D1, and the macroporous diameter in bent axle location is D2, and the diameter of through -hole is D3, D1= (0.65~0.99) D3 and D2= (1.01~1.35) D3, R > 0.5 (D2 + D3), the diameter D3's of through -hole scope is 8mm to 72mm, but the aperture is fixed a position to the bent axle of different carburization quenching units, the macroporous diameter in bent axle location can the same also diverse. The utility model discloses simple structure, can make the carburization quenching distortion volume of bent axle and bent axle spline little, not only improve the kind of shove charge, improve the charge batch of bent axle moreover.