1. An ice bucket of a food grade ice machine includes a cylindrical ice bucket body (3), a refrigeration mechanism arranged around the ice bucket body (3), an upper cover plate (6) covering the upper end of the ice bucket body (3), and a reducer (I) mounted on the upper cover plate (6). The ice bucket body (3) is characterized in that a dispersed water tray (2) fixedly connected with the reducer (I) is arranged inside the ice bucket body (3). (2) The water tank (5) connected to the lower end of the ice bucket body (3) is connected through the intake pipe (7), and the water in the water tank (5) is pumped to the sprinkler plate (2) by a water pump (8) arranged on the intake pipe (7). An ice crushing mechanism fixed with the sprinkler plate (2) is arranged at the lower part of the sprinkler plate (2) and near the inner wall of the ice bucket body (3). The ice crushing mechanism includes an ice crushing axis (9) parallel to the middle axis of the ice bucket body (3) and spiral winding. The ice knife (4) on the ice crushing shaft (9) has a composite structure, the inner wall of which is a heat exchange layer (13) made of stainless steel, and the outer wall of which is a base material layer (14).