The present invention discloses a spheroidal elastic large-tonnage axial and deflection test device and method. The device comprises an axial deflection device and a large-tonnage loading center; thelarge-tonnage loading center comprises a frame, a plurality of vertical oil cylinders installed at the bottom portion of the frame, and a platform movably installed on the vertical oil cylinders; eachvertical oil cylinder comprises one fixing plate, one spheroidal support base, one height regulation support base, one rotary arm, one location ring, one fixing cross beam, one adjustable supportingbar, one press rotation oil cylinder, one rotation pin 1, one vertical connection rod, one rotation pin 2 and one stressing connection rod. The method comprises a static test method, a fatigue test method, test installation and test dismounting. The spheroidal elastic large-tonnage axial and deflection test device and method provide a set of test device and method for the large-tonnage axial and deflection test, can perform large-tonnage axial preload and high-torque deflection combination load test for a flexible connector elastomer of a water insulation tube and test the mechanical properties of the water insulation tube flexible connector in different work conditions.