The invention discloses a camber surface wave transmission and bidirectional reception focusing ultrasonic imaging new method, which aims to overcome the defects of slow speed, large transmitting dosage and low resolution of the conventional ultrasonic imaging, eliminates the problem of thickness artifact generally exiting in the conventional ultrasonic imaging and belongs to a technical breakthrough in the field of medical ultrasonic imaging. The technical core is that camber surface wave is transmitted in the lateral direction by using an electronic phased array matrix probe by controlling time delay of ultrasonic wave transmitted by each array element, and meanwhile, transmission focusing is performed in the thickness direction, so that a focusing region is positioned at a part which is 1/2 the maximum investigation depth; after transmission, dynamic reception focusing in lateral direction and thickness direction is performed on each determined sound wave of a pixel back-scatter probe on a camber surface in the thickness direction from shallow to deep respectively; and pixel information of each layer is acquired and stored for imaging. Through the method, the defects of the conventional ultrasonic imaging can be overcome, the thickness artifact is eliminated, the quality of two-dimensional ultrasonic imaging is greatly improved, and important theoretical significance and practical significance are realized.