The present invention provides a clutch structure for a cultivator, mainly comprising an outer case, two bearings respectively disposed on two sides of the outer case, two rotary shafts which are respectively penetrated through the two bearings, arranged on the same axis and having two walls respectively configured with a plurality of insertion grooves, a shaft sleeve which is disposed on the two rotary shafts in the outer case and configured with through holes respectively corresponding to the insertion grooves of the two rotary shafts, two positioning steel balls respectively disposed in the through holes of the shaft sleeve, a transmission gear which is fixedly disposed on the shaft sleeve and has two sides respectively disposed with two slide seats that are correspondingly arranged and slidable on the shaft sleeve, and two stop flanges respectively disposed on the outer walls of the two slide seats. Further, the interiors of the two slide seats, which are sleeved on the shaft sleeve, are provided with two relative inner sides that are respectively formed with position limiting holes and two relative outer sides that are respectively formed with disengaging grooves. The two slide seats are further provided with guide grooves that are formed with beveling surfaces and located between the position limiting holes and the disengaging grooves. Two springs disposed on the shaft sleeve are respectively located between one side of the transmission gear and one slide seat and between the other side of the transmission gear and the other slide seat. In addition, two toggle members arranged in the outer case are respectively protruded with two levers that are respectively configured outside the two stop flanges of the two slide seats. Accordingly, a clutch structure with controllable steering convenience can be obtained.
