In order to overcome the defect that the energy distribution is non-uniform and the shape of the spot does not match with the PV cells in the laser wireless power transmission receiving system, a trapezoid secondary concentrator was designed and processed. Based on edge ray principle, the design method of trapezoid secondary concentrator was analyzed and simulated by Tracepro software. And a trapezoid secondary concentrator was processed by four right angled trapezoid mirrors. Then the effect of the trapezoid secondary concentrator was studied through laser wireless power transmission system. The photoelectric conversion efficiency of PV cells under Fresnel lens single concentrator and combining with the trapezoid secondary concentrator was compared. Experimental results indicate that the value of photoelectric conversion efficiency of united concentrators was improved about 6%-7% compared with Fresnel lens single concentrator under the same received power of PV cells. If adding the loss of the secondary concentrator, the value of photoelectric conversion efficiency of united concentrators was improved about 2%-3%. It indicates that the trapezoid secondary concentrator could enhance the performance of laser wireless power transmission receiving system.