The invention discloses a die-casting die pre-ejection structure not prone to ineffectiveness and belongs to the related technical field of die-casting dies. Through preferable arrangement of a springfixing rod, a fixed die push rod ejector rod, a disc spring and a spring base which can be correspondingly assembled, the two ends of the disc spring can abut against the end face of the spring baseand the end face of the fixed die push rod ejector rod correspondingly in a connection manner when the die-casting die is not assembled, it is ensured that the disc spring is in a non-compressed state, and therefore it is effectively avoided that the disc spring is pre-compressed when not in work. The die-casting die pre-ejection structure is simple, easy and convenient to arrange, not prone to ineffectiveness, high in stability and capable of effectively avoiding that the disc spring is pre-compressed when not in work, reduces breakage and damage of the disc spring, greatly increases the number of circular use times of the disc spring, reduces the use cost, the overhaul cost and the maintenance cost of the pre-ejection structure, ensures the continuity and stability of the die-casting diein the application process and has good application prospect and popularization value.