The invention discloses a pool wall prefabricated block splicing structure suitable for a static pressure assembled pool and a construction method thereof. The splicing structure comprises a prefabricated block which is spliced along the circumferential direction to form a pool wall, a steel bar which penetrates through the prefabricated block and extends out from the circumferential end part of the prefabricated block, a splicing block which is positioned at the circumferential end part of the prefabricated block to form the outer wall of the pool and a soil retaining block which is positioned at the bottom of the prefabricated block, and the splicing block and the soil retaining block are enclosed to form a connecting groove for circumferential splicing, when the prefabricated blocks are assembled along the circumferential direction, two opposite steel bars in the connecting grooves of the adjacent prefabricated blocks are fixedly connected with each other, and concrete is filled inthe connecting grooves to form cast-in-place blocks. The construction method comprises the following steps of determining the size and the quantity of the prefabricated blocks according to the size of the water pool; manufacturing the prefabricated block, pressing the prefabricated block into a soil body, and butting the steel bars; pouring concrete to form the cast-in-place blocks. According tothe splicing structure and the construction method, the prefabricated block and the cast-in-place block are assembled to form the pool wall, and the prefabricated structure and the cast-in-place structure are combined, so that the anti-seepage performance of the pool wall is improved, and the integral rigidity of the structure is guaranteed.