The invention discloses a connecting structure of an inner discharge pipe of a refrigerator compressor, comprising a non-metallic inner discharge pipe, a metal external discharge pipe, a sealing device and limiting devices, wherein a connecting end of the metal external discharge pipe is provided with limiting through holes; a connecting end of the non-metallic inner discharge pipe extends into the connecting end of the metal external discharge pipe; the limiting devices are correspondingly clamped in the limiting through holes; and the sealing device is arranged between the connecting end ofthe non-metallic inner discharge pipe and the connecting end of the metal external discharge pipe. According to the connecting structure, the non-metallic inner discharge pipe and the metal external discharge pipe are mutually connected, so that a pipe fitting joint is simple in structure, convenient to install and use, and suitable for popularization and use, and solves the problems of complex connection and high material cost of an inner discharge pipe of the existing refrigerator compressor.