To provide an ice block cutting device and an ice block cutting method capable of setting a cutting direction in a direction perpendicular to the centerline of an ice block and rapidly performing a cutting operation in cutting the ice block into block ices when square ices are manufactured.

This ice block cutting device comprises an endless carrying body 2 carrying the ice block 10, an ice cutter 3 having a plurality of circular saws 4 having a cutting direction set in the carrying direction of the endless carrying body 2, disposed parallel with each other at specified intervals, and having blade parts 8 positioned at the height of the ice block, and a groove part disposed on the upper side of the endless carrying body 2 and allowing the round saws to pass therethrough. Also, the ice block cutting device comprises an ice block loading table plate 5 having a sloped surface for tiltedly arranging the ice block 10 relative to the carrying direction to cut the ice block into some block ices from one direction.