The invention discloses an energy-saving refrigerator refrigeration system achieving the logically self-adaptive rotating speed of a compressor. The energy-saving refrigerator refrigeration system comprises the variable-rotating-speed compressor, a frequency conversion control board, a mechanical temperature controller and a refrigeration circulation pipeline system. The frequency conversion control board comprises a power rectifying and filtering module, a switching power supply module, a master control circuit module, a driving module, an inverter circuit module and a communication module. The variable-rotating-speed compressor comprises a crankcase with an oil return structure, the surface of an axial hole of the crankcase is provided with a plurality of oil grooves distributed along the circumference, an oblique wide groove and an annular groove, and a round oil leaking hole is formed in the top of the wide groove; an annular check ring is arranged on the upper end face of the crankcase and located within the central range of a motor wire packet of the inverter compressor, and an oil leaking hole is formed in the position of the annular check ring; and an edge check ring is arranged on the lower end face of the crankcase. According to the energy-saving refrigerator refrigeration system, while the rotating speed of the compressor is set to achieve the refrigeration effect needed by clients, the purpose of reducing resource cost and energy consumption is achieved.