The invention discloses a step-by-step regulation device for a loom. The step-by-step regulation device comprises a body (1), a driving rod (2) penetrating the upper end of the body (1), a plurality of gears (3) which are fixedly arranged on one side of the body (1) through a fixing rotating shaft (31) and are adjacently connected in turn in a clamping mode, a conveying roller (6) driven by the gears (3) to rotate, and a main drive (4) arranged in the body (1) and connected with the gears (3). The bottom end of the driving rod (2) is provided with driving teeth connected with one of the gears (3); the other side of the body (1) is provided with a controller having a step-by-step state and a continuous state; when the controller is in a step-by-step state, the driving rod (2) drives the gears to rotate in a step-by-step mode; and when the controller is in the continuous state, the main drive (4) drives the gears (3) to continuously rotate. The step-by-step regulation device can perform step-by-step operation on the loom to avoid a phenomenon that production cost is wasted because the whole loom is started to weave a section of yarns.