The utility model discloses a portable wheat blade area survey device. The device constitutes hinge type main structure body device by upper cover and base, the outside one side of upper cover is provided with display panel, computed push -buttom, the inside one side of upper cover sets up thoughts light panel, be provided with photoelectric sensor and the control unit in the upper cover, photoelectric sensor and the control unit are connected with display panel, calculation button member respectively, the base is provided with the glass protecting cover with the one side that the upper cover contacted, be provided with at least one LED lamp in the base. This device can calculate the leaf area size according to panel accurate?determination?of leaf is long and the leaf is wide, measurement accuracy: 2%, the instrumental resolution: 1mm2: host computer and the integrated design of feeling light panel are realized to the product, realizing the real -time measurement to the blade surface area, can measuring the multiple parameter of blade according to the control unit's settlement, convenient operation, test are quick, accurate, the data of being convenient for batch processing.