The present invention relates to an algorithm teaching apparatus. More specifically, the present invention relates to an algorithm teaching apparatus that uses blocks that can be played with like toys by children and facilitates easy teaching of an algorithm. The apparatus is divided into an event region, an execution region and a condition region, wherein an event block mounting part of the event region and an execution block mounting part of the execution region are formed so as to have different shapes, thus facilitating efficient teaching of the basic principles of an algorithm to children.