A modularized bed-ridden patient translation transfer machine comprises a first module, a second module, a third module and a fourth module which are sequentially connected in parallel through a plurality of threaded rods, wherein the first module, the second module, the third module and the fourth module adopt identical structures and each comprise a lower mechanical transmission device and an upper mechanical transmission device; each lower mechanical transmission device is used for driving the modularized bed-ridden patient translation transfer machine to move on a bed surface; each upper mechanical transmission device is located on the corresponding lower mechanical transmission device, and is driven by the corresponding lower mechanical transmission device to transfer a bed-ridden patient from one bed to another bed. The machine provided by the invention is convenient to dismount, mount and transport; the machine abandons the traditional method in which the lying patient is carried by multiple persons, and achieves automatic transfer of the patient who is injured or paralyzed, or who needs to be transferred before and after an operation; without changing the posture of the patient, a nurse can individually transfer the patient from a hospital bed to a stretcher, or from the stretcher to the hospital bed, so that the labor intensity of the nurse is reduced, the safety and comfort of the patient are improved, and secondary harm to the patient caused by the traditional method is avoided.