The invention discloses a construction method of a water purification type ecological protection 
bank. The construction method of the water purification type ecological protection 
bank comprises the following steps of a, opening a foundation pit; b, dividing regions; and c, building the ecological protection 
bank. According to the construction method of the water purification type ecological protection bank provided by the invention, through designing a fixed support and an installation plate, the top part of the ecological protection bank can be further installed and fixed, so that the structural strength and the 
structural stability of the ecological protection bank are improved, and the ecological protection bank can 
resist the 
impact force of a 
water flow; meanwhile, when bottom-layerecological building blocks are paved, through designing reinforced gear blocks, not only can the structural strength of the bottom-layer 
ecological building blocks be ensured, but also the 
contact strength between the bottom-layer 
ecological building blocks and soil can be improved, so that the ecological protection bank is not easy to deform; meanwhile, each two adjacent 
ecological building blocks can be spliced and further connected and fixed through fixed screws, so that the connecting strength between the adjacent ecological building blocks is effectively ensured; and an auxiliary plantinghole is formed between each two adjacent ecological building blocks and is matched with ecological planting holes of the ecological building blocks, so that a 
greening area of the ecological protection bank is enlarged.