The invention relates to a stable-type CT machine with an adjusting function. The stable-type CT machine with the adjusting function comprises a main engine, a base, a transmission frame and a bed, and further comprises an adjusting mechanism and a fixing mechanism, wherein the adjusting mechanism comprises a driving assembly, a connection board and a bed board, the driving assembly comprises a telescoping frame, a movable board, two hinged boards and two driving units, the fixing mechanism comprises a fixing box, a fixing assembly is arranged in the fixing box, and the fixing assembly comprises a rotary knob, a rotating shaft, a gear, two racks and two fixing boards. According to the stable-type CT machine with the adjusting function, through the adjusting mechanism, the length of the bedcan be adjusted, thus the use requirements of patients in different heights are met, through the fixing mechanism, the heads of the patients can be fixed, and effects of change of head positions of the patients on examination results are avoided.