The invention discloses a suction structure of a refrigeration compressor. The suction structure is a connecting structure between a suction pipe of the compressor shell and a suction plate of the compressor, and comprises a suction muffler and a bellows, wherein the bellows is connected on the suction muffler or is in line contact with the suction muffler; the suction muffler comprises a suction pipe I, an expanding cavity, a suction pipe II and a sealed suction pipe of a resonator; the suction pipe I, the expanding cavity and the suction pipe II are in serial connection; the sealed suction pipe or the resonator is respectively connected with the suction pipes; the first resonating frequency of the cavity of the resonator or the sealed suction pipe is between 80-210Hz; both the first and second resonating frequencies of the cavities of the suction structure determined by the work frequency of the compressor are between 45-160Hz. According to the suction structure of the refrigeration compressor, the noise reduction and vibration damping are realized and the stable suction and pressure boost effect is achieved; the refrigeration performance of the refrigeration compressor is greatly improved and the suction structure can be stably and reliably implemented on specific process.