The invention discloses an inertia moment balance mechanism of a line spaced opposite type X-shaped reciprocating compressor. The inertia moment balance mechanism comprises a crankshaft. A first balance weight and a second balance weight are arranged on opposite main journals of two cranks of the crankshaft correspondingly, the mass of the first balance weight and the mass of the second balance weight are both M1, and the turning radius of the first balance weight and the turning radius of the second balance weight are both r1. M1r1=msr. A drive gear is arranged on a main journal of the crankshaft. A first driven gear is arranged in the radial direction of the drive gear and is engaged with the drive gear. A pair of axisymmetric third mass and fourth mass is arranged at the axial distancesL of the two ends of a shaft of the first driven gear, wherein the third mass and the fourth mass are diagonally arranged, and the turning radius of the third mass and the turning radius of the fourth mass are both r0. The mass magnitude of the third mass and the mass magnitude of the fourth mass are both m0, and the third mass and the fourth mass are symmetrically arranged on the two sides of the shaft of the first driven gear correspondingly. Lr0m0=erms. According to the inertia moment balance mechanism, the first-order inertia moment and the second-order inertia moment of the line spaced opposite type X-shaped reciprocating compressor are zero; and the vibration speed and the vibration accelerated speed of the X-shaped multi-line-height reciprocating compressor reach the minimal value.