The invention provides a two-dimensional area array ultrasonic transducer and a manufacturing method thereof. The two-dimensional area array ultrasonic transducer comprises a piezoelectric array element array layer, array element electrodes, decoupling materials, backing blocks, electrode leads, a public electrode and a matching layer, wherein the piezoelectric array element array layer is formed by arranging M*N piezoelectric array elements which are divided by joints and used for receiving or transmitting ultrasonic signals, the array element electrodes are sputtered on the first surface of the piezoelectric array element array layer and cut and divided according to the joints, each array element electrode corresponds to one piezoelectric array element, the joints are filled with the decoupling materials which are used for lowering crosstalk interference of the piezoelectric array elements, the backing blocks are stuck to the array element electrodes and used for absorbing sound energy of the back faces of the piezoelectric array elements, the electrode leads are arranged on the backing blocks, the public electrode is sputtered on the second surface of the piezoelectric array element array layer, and the matching layer is stuck to the public electrode and used for achieving impedance matching between the piezoelectric array elements and external objects.