The invention relates to the technical field of livestock feeding devices, in particular to an automatic feeding device for porcupines. The automatic feeding device comprises an enclosing wall, a floor, an eating portion, a horizontal cutting system and a vertical cutting system, the eating portion comprises a feeding hopper, a material cutting tank, a pig feed tank, a discharging port and a flowing material tank, the material cutting tank is communicated with the pig feed tank through the flowing material tank, the material cutting tank is positioned above the pig feed tank, the horizontal cutting system comprises a water bag, a water tank, a cover, a piston cylinder, a piston, a horizontal cutting knife, a first water pipe and a third water pipe, a one-way water outlet valve is arrangedon the first water pipe, a water pump and a one-way water inlet valve are arranged on the third water pipe, the vertical cutting system comprises an L-shaped arm rod, a second water pipe, a switch valve and a vertical cutting blade group, a stopper is arranged on the lower portion of the L-shaped arm rod, a cross rod is arranged on the stopper, a first lever is arranged between the stopper and theswitch valve, a second level is arranged on the first level, a third level is arrange don the second level, and a downward pressing piece is arranged at the lower end of the third level. By the aid of the technical scheme, food can be supplied as required when the porcupines are fed.