A kind of expansion ultraviolet disinfecting machine includes a pedestal group, number revolving type lamp group, and an at least extended position lamp group. The pedestal group has a moveable pedestal. The grade revolving types lamp group is to surround axis arrangement to be hubbed on one top surface of pedestal. The extended position lamp group is the pedestal to be arranged in extensiblely along the vertical axis direction, and stretch the low what base top surface of height. Thereby, the equal revolving types lamp group is in addition to can be on the base other than any turn adjustment tilt angle in side, and the extended position lamp group can stretch through into the lower section of indoor appliances, and then expand ultraviolet light covering scope, and mention Noboru bactericidal effect of the invention.一種展開式紫外線殺菌機，包含一底座組、數旋動式燈組，及至少一伸展式燈組。該底座組具有可移動的一底座。該等旋動式燈組是環繞一軸線排列樞設在該底座一頂面。該伸展式燈組是沿垂直該軸線方向可伸展地設置在該底座，且伸展高度低於該底座頂面。藉此，該等旋動式燈組除了可以在該底座上方任意旋動調整傾斜角度外，且該伸展式燈組可穿伸入室內用具的下方，進而擴大紫外線涵蓋範圍，並提昇本發明的殺菌效果。
