The present invention discloses a raising and lowering mechanism for plant light, comprising: a base, a plurality of light source carrying base, a rope, a rope winch, a telescopic frame, and a control module. Particularly, there is a counter unit and an inching movement recording unit provided in the control module, and the control module is configured for controlling a rotary shaft of a motor of the rope winch to complete at least one inching rotation along a clockwise direction or a counterclockwise direction, such that the base is driven by the rope so as to have an upward inching movement or a downward inching movement. In the present invention, the counter is adopted for counting the direction, times and/or frequency of the inching rotation, and therefore the control module is able to know a total movement distance of the base by using the inching movement recording unit to record each time of the upward inching movement and each time of the downward inching movement. Therefore, by making a GoBack command to the control module, a user is able to control the base to move back to a specific position such as an initial position or a previously-staying position.本發明揭示一種植物燈升降機構，主要包括一座體、複數個光源攜載座、一升降纜繩、一纜繩收放模組、一連動伸縮模組、與一控制模組。特別地，本發明於該控制模組之中設置一計數器與一吋動紀錄器。該控制模組可控制該纜繩收放模組之馬達的一轉動軸進行至少一次的一順時針方向吋動旋轉或至少一次的一逆時針方向吋動旋轉，進而透過該升降纜繩帶動該座體進行一吋動式向上位移或一吋動式向下位移。特別地，該計數器用以計數每次吋動旋轉的方向、次數及/或時間，且該吋動紀錄器用以紀錄吋動式向上位移與吋動式向下位移之一總位移距離。因此，使用者可以透過操作控制模組方式，吋動式地逐次調整該座體的高度，也可以將該座體一次性地復歸(GoBack)至一特定位置，例如：初始位置或前次停留位置。
