An improved curtain guiding block structure may include a block body, a first wheel base, a second wheel base and a plurality of rolling balls. During the assembly process, the second wheel base is inserted into the circular hole of the block body from one side, and the first wheel base is inserted into the circular hole of the block body from the other side after the rolling balls are disposed therein; and the guiding post plugs into the through hole of the second wheel base to complete the assembly process without using any additional tools.