The invention discloses a manufacturing method for a penetration-type crack of a large-size concrete block. A key point of the method is as follows: firstly pouring a concrete block to be pressed, andbreaking the concrete block, replacing a section of the broken concrete block in a mould and forming a first-pouring concrete block, pouring concrete into an empty part remained in the mould, forminga later-pouring concrete block, finally breaking the concrete block by using a construction gap between two parties, re-closing under the action of a guiding pipe, and forming the penetration-type crack. The manufacturing method for the penetration-type crack of the large-size concrete block is capable of successfully separating the large-size concrete block and splicing two sections exactly after separating.