The invention discloses a feeding system of a bottle cap automatic hot stamping machine. The feeding system comprises a material processing plate, a feed chute, a distributing device, an original-direction guide chute, a backward guide chute and a hot stamping feed chute which are connected in sequence, wherein the distributing device is provided with a feeding position for receiving round bottlecaps and a first discharging position and a second discharging position which are used for outputting the round bottle caps forwards and backwards according to classes; the front end of the original-direction guide chute is in butt joint with the first discharging position; the front end of the backward guide chute is in butt joint with the second discharging position, and the backward guide chute is a knobbed chute which outputs a product by turning the product for 180 degrees and limit the product in four directions. The bottle caps output by the material processing plate are in forward direction and backward direction, and the bottle caps in different directions are discharged respectively from the two discharging positions through the distributing device, the backward bottle caps are turned for 180 degrees and output by the backward guide chute to ensure that the round bottle caps are output in the same direction for being subjected to hot stamping.