The invention relates to a wearing electrocardiogram measuring device and electrocardiogram compression method, which makes the volume size of the machine to be able to be carried by the patient, so that the electrocardiogram data can be measured and acquired anytime and anywhere for the patient. At the same time, when the electrocardiogram data is being compressed, the frequency band is first decomposed to obtain a plurality of frequency band data then, through a quantifying and error control step, obtaining the quantifying scale, a plurality of quantified data, and a plurality of truncation error data next, summing up the quantifying scale respectively with the product of each truncation error data to obtain a distortion value. If the distortion value can meet the predetermined distortion value, the quantified data is encoded to obtain an electrocardiogram compression data. Thus, compared with the conventional electrocardiogram compression means, the invention does not need to carry out the steps of decoding analysis, inverse quantification, inverse frequency band decomposition and so on to realize the quality assurance mechanism, and save nearly a half of the operation time of the processor for energy saving effect.本發明創作主要係關於一種穿戴式心電圖量測器,主要係透過一主機之體積大小可令病患隨身攜帶,以令病患得以隨時隨地量測並取得心電圖資料,同時,該心電圖資料進行壓縮時,先進行頻帶分解而得到複數頻帶資料,再於量化及誤差控制之步驟取得一量化尺度、複數量化資料、及複數截斷誤差資料,接著將該量化尺度分別與各截斷誤差資料之乘積進行累加得到一失真值,若其失真值滿足失真預設值,則將該量化資料進行編碼而得到一心電圖壓縮資料。也因此,相較於傳統心電圖壓縮手段,本發明創作無須進行解碼分析、反量化、反頻帶分解等步驟即可實現品質保證機制,可替處理器省下近一半之運算時間,進而具有節省能源之功效。