The invention discloses a mechanical patient transferring trolley and belongs to the field of special patient transportation tools. The mechanical patient transferring trolley comprises an upper trolley frame, a middle trolley frame, a lower trolley frame, a lifting device arranged between the lower trolley frame and the middle trolley frame, an overturning device arranged between the middle trolley frame and the upper trolley frame, a horizontal moving device arranged on the upper trolley frame and multiple sliding carrying plates which are mutually isolated. A scissor jack is used for ascending and descending the upper trolley frame and the middle trolley frame. A screw nut pair is used for overturning the upper trolley frame. A horizontal guide rail and a rolling bearing are used for horizontally moving the sliding carrying plates which are used for flexibly transferring a patient. The mechanical patient transferring trolley is flexible and convenient to operate, small in number of nursing personnel, needless of greatly moving the patient and capable of avoiding secondary injury in the patient transferring process and has the advantages of being simple in structure, low in cost, convenient to maintain, stable in operation and low in noise.