The invention provides a hydraulic automatic net up-putting and timber loading device. Distance between a movable pulley block and a fixed pulley block is changed through extension and contraction of a jack plunger to change extending and contracting length of a free end of a steel wire rope so as to drive a guide pulley to rotate. The hydraulic net up-putting and timber loading device is controlled to realize hydraulic net up-putting and timber loading effect by changing the length of the free end. The automatic device is adopted, so that work strength of operating personnel can be effectively reduced, the operating personnel can be stopped from frequently entering a coal wall side for net up-putting and timber loading, potential safety hazards during operating are reduced, and coal mining efficiency can be improved.