A net fixing rack structure includes a base, a fixing tube, and a mounting tube. The base is formed with an oblique through hole. The fixing tube has a first end formed with a pin rod and a screw portion and a second end formed with a transverse through hole. The mounting tube is mounted on the fixing tube. The oblique through hole of the base has a determined inclined angle, so that the fixing tube is fixed in the ground with a determined inclined angle. Thus, after the whole net fixing rack structure is assembled, the mounting tube is inclined relative to the ground with a determined angle, thereby enhancing the supporting effect of the net fixing rack structure.