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In the application of pipeline engineering, polyethylene (PE) pipe has obvious advantages over other materials due to its good corrosion resistance and toughness, and has been widely used in the fields of nuclear power and oil and gas transmission. During PE pipe welding, welding parameters, personnel operation, environment and other factors will affect the welding of PE pipes, which may cause defects in the welded joints and affect the safe operation of pipes. Phased array ultrasonic testing technology can realize nondestructive testing and evaluation of the internal structure of polyethylene pipe welded joints. Through the practical phased array ultrasonic inspection of PE pipe welded joints, this paper studied the sound attenuation law and sound dispersion effect of polyethylene materials, optimized the ultrasonic phased array inspection process of welded joints, realized the sound field simulation and defect simulation of PE pipe phased array ultrasonic inspection based on CIVA simulation software, and studied the impact of the change of detection parameters and acoustic parameters on the inspection results, The optimum inspection process of PE pipe welded joint was obtained. This paper also processed the polyethylene hot-melt butt joint sample with typical defects, and carried out reliability test and process test on the inspection process designed based on the simulation results in the early stage and the wedge coupling module developed for the phased array inspection of welded joints.