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A low-power-consumption efficient coal screening machine comprises a rack, a screen body driving mechanism and a transmission mechanism. The coal screening machine is characterized in that side projections of screen strips forming screen faces are curves, a strip-shaped screen hole is formed by linking multiple unit screen hole sections formed by the adjacent screen strips in an opposite mode, each unit screen hole section is wide gradually and becomes narrow suddenly from the feeding direction of coal to the discharging direction of the coal, and the screen strips are installed on each screen body in a high and low stagger mode at selected intervals. On the coal screening machine with the screen bodies swinging at low frequency, a collision head or a hard spring is arranged on the rack and retraced when impacting the screen bodies. Generally the coal screening machine with the multiple-stage screen bodies is composed of the multiple screen bodies which swing independently and are arrayed longitudinally in a stepped mode. The low-power-consumption efficient coal screening machine has the advantages that in the work process, the screen faces swing transversely at low frequency with a large amplitude, the effect that the special screen faces and screen bodies are impacted to be retraced in the swing process is combined, loosening and delamination of the coal are facilitated, the screening process of the coal is improved substantially, the screen faces are not blocked or stuck by the coal, the maximum screening capacity and the maximum screening efficiency are obtained, and the screen through rate for screening inferior coal high in ash content and water content is improved substantially.