The invention discloses a cross-flow fan blade based on bionics. The blade is formed by arranging a plurality of blade units in the axial direction of an impeller, the front edges of the blade units protrude, the rear edges of the blade units are concave inwards, the middle portions of the sides, close to the front edges, of the upper surfaces of the blade units are higher than the two sides, themiddle portions of the sides, close to the rear edges, of the upper surfaces of the blade units are lower than the two sides, and the middle portions of the sides, close to the front edges, of the upper surfaces of the blade units are higher than the middle portions of the sides, close to the rear edges, of the upper surfaces of the blade units. By the adoption of the cross-flow fan blade based onbionics, airflow flowing of the front edge and rear edge of the blade can be improved, an eccentric vortex moves downwards, the efficiency of a cross-flow fan is improved, and energy consumption is reduced.