The invention relates to the technical field of medical equipment, in particular to a sitting and lying dual-purpose patient transfer machine. The sitting and lying dual-purpose patient transfer machine comprises a transfer mechanism and a bed frame mechanism, wherein the transfer mechanism comprises a pedestal, a first motor, a first driving pulley, a screw rod, a first driven pulley, a second driving pulley, a second driven pulley, a first driving belt for connecting the first driving pulley and the first driven pulley, a second driving belt for connecting the second driving pulley and the second driven pulley, a nut sliding block spirally arranged on the screw rod in a sleeving way, a push plate assembly connected with the nut sliding block, a second motor, a third motor, a belt head driving roller connected with the second motor, a belt tail driving roller connected with the third motor, and a carrying belt; and the bed frame mechanism comprises a bed backrest plate, a bed seat plate and a bed leg plate which are hinged sequentially from front to back. By utilization of the sitting and lying dual-purpose patient transfer machine, a nurse can transfer old people/a patient in a lying posture from a bed to a transfer vehicle or transfer the old people/the patient from the transfer vehicle to the bed safely and stably without body contact; furthermore, the transfer vehicle can be folded into a wheelchair state.