Relative gravity sensing device based on spatial cross flexible supporting structure

The invention discloses a relative gravity sensing device based on a spatial cross flexible supporting structure. The relative gravity sensing device comprises a closed cavity formed by an outer frame, a cover plate at the top of the outer frame and a base plate at the bottom of the outer frame; an upper annular polar plate is arranged at the bottom of the cover plate, a lower annular polar plate is fixed on the base plate, and the upper and lower annular polar plates are arranged coaxially; a pendulum is arranged inside the closed cavity, and the pendulum comprises a left pendulum body and a right pendulum body which are connected with each other by a cross flexible supporting component; the left pendulum body is positioned between the upper annular polar plate and the lower annular polar plate, and magnetic steel and a magnetic cap are fixed at the lower part of the left pendulum body; a coil assembly fixed on the base plate is arranged in the lower annular polar plate; the coil assembly is positioned on the periphery of the magnetic steel, the magnetic steel and the coil assembly are arranged coaxially, and the left pendulum body, the magnetic steel and the magnetic cap constitute a mass block of the relative gravity sensing device; and the right pendulum body is fixed on the bevel on the right of the base plate. The relative gravity sensing device has the advantages of small size, high sensitivity, good stability and the like.