The invention relates to a shield segment joint water leakage test method. The method comprises steps of (1), making a water inlet pipe; (2), cutting a segment; (3), making a hollow square groove; (4), making a hollow square sealing pad; (5), coating waterproof glue on a groove surface; (6), assembling the segment, and accomplishing model making; (7), automatically controlling selection of permeameters; (8), loading; (9), utilizing a variable head method or a fixed head method to carry out a tunnel water leakage test; and (10), changing a loading grade, repeating the steps (8) and (9), and acquiring joint force bearing-splaying amount-water leakage relationships. The method is advantaged in that the hollow square groove is made at a segment joint, the variable head method or the fixed head method is utilized to carry out the shield tunnel joint water leakage test, a technical problem in utilizing the shield segment to carry out the tunnel water leakage test is solved, relationships between segment water leakage and influence factors are more accurately reflected, moreover, segment force bearing-joint water leakage, joint splaying amount- joint water leakage relationship curves can be acquired.