The present invention is an adjustable length muscle electrical stimulator, comprising: a body, a control module, two extended patches and two rail bases； at least one first electrode portion is disposed at the bottom of the body； the control module is disposed at the The body is electrically connected to the first electrode portion of the body； the two extending patches are disposed on two sides of the body, and at least one extended electrode portion is disposed at a bottom thereof, and the electrode portions are electrically connected to the control module The two rail bases are disposed in one of the rail cavities of the two extending patches, so that the rail cavities can be slidably displaced forward and backward in the rail base, and the front ends of the two rail bases are provided The first buckle is fastened to the second buckle on the two sides of the body； thereby, the design of the two rail cavities can be shifted relative to the front and rear of the rail base. Having the two extended patches extend outwardly and retracted inwardly, and can flexibly adjust the area of use for use with muscle groups at different positions； and when the two extended patches are adjusted to adjust their position of use Electrical stimulation and heating are not stopped.本創作係一種可調整長度之肌肉電刺激器，包括：一本體、一控制模組、二延伸貼片及二導軌基座；本體底部設至少一第一電極部；該控制模組設於該本體上，其係與該本體之第一電極部電性連接；該二延伸貼片設於該本體之二側，其底部設至少一延伸電極部，該等電極部係與該控制模組電性連接；該二導軌基座設於該二延伸貼片內之一導軌腔體中，而能使該導軌腔體於該滑軌基座中作前後滑動位移，該二導軌基座前端設有一第一扣具，該等第一扣具與該本體二側邊上之第二扣具相互扣合；藉此，透過該二導軌腔體能相對於該滑軌基座中前後滑動位移之設計，令該二延伸貼片可向外延伸及向內縮回，而能伸縮調整其使用區域，以供配合不同位置之肌肉群之使用；且當該二延伸貼片在伸縮調整其使用位置過程時不會停止電刺激與加熱動作。
