An improved method for measuring the rotating speed of a hermetically sealed refrigeration compressor comprises the following steps of (1) current signal acquisition in which a current following sensor and a high-speed data acquisition card acquires supply current of a motor; (2) data storage in which LabView acquires and stores digital signals subjected to A/D conversion, (3) effective signal extraction based on Hilbert transform in which the digital data is processed for the acquired data; (4) frequency domain conversion in which linear frequency modulation Z-transform processes the signals to obtain a frequency-domain signal; (5) rotating speed extraction in which the maximum value of the above frequency domain signal is extracted, an obtained frequency is multiplied by 60 to be used as the rotating speed of the compressor. The improved method for measuring the rotating speed of a hermetically sealed refrigeration compressor has high measurement accuracy, good environmental immunity, and simplified measurement equipment.