The utility model discloses a milk powder machine and a milk powder mixing device of the milk powder machine. The milk powder mixing device comprises an outer conical cup (1), a water inlet pipe (2) and an inner conical cup (3), wherein the water inlet pipe (2) is arranged on the water inlet pipe (2) is arranged on the outer conical cup (1), the included angle between the water inlet pipe (2) and the tangent line of the joint is smaller than 90 degrees, and the joint is the connection position of the water inlet pipe (2) and the outer conical cup (1); the inner conical cup (3) is sleeved with the outer conical cup (1), the outer wall of the inner conical cup (3) and the inner wall of the outer conical cup (1) form a water flowing channel, the water inlet pipe is communicated with the water flowing channel, and an inner cavity of the inner conical cup forms a milk powder channel used for being communicated with milk powder outlet (41) of an installation board (4). The milk powder mixing device prevents milk powder from blocking, and improves mixing uniformity of the milk powder and water.