The invention belongs to the electronic technical field, and relates to a constant current outputting and driving circuit of a current sink, which has the load short circuit protecting function. The constant current outputting and driving circuit comprises a driving unit and a load short circuit protecting unit, wherein, the driving unit provides a drive working current for load; the load short circuit protecting unit comprises a sampling circuit, a comparing circuit and a control signal output / turn-off circuit; when the load normally works, the load short circuit protecting unit provides a control signal for the power switch tube of the driving unit; when the load has a short circuit, the load short circuit protecting unit outputs low level, thereby automatically cutting off the power switch tube of the driving unit, protecting the whole driving circuit, and avoiding the chip damage caused by the overlarge current during the load short circuit. As the source end of a sampling MOS tube is connected with the input end, the constant current outputting and driving circuit is high voltage resistant, and does not need an additional ESD structure; at the same time, the adopted circuit elements are basic circuit elements such as logic gates, selectors, MOS tubes, capacitors, etc., thereby having the advantages of low cost, simple structure, good reliability, etc. The constant current outputting and driving circuit can be not only applied to the LED drive.