The invention discloses an optical fiber light trap acceleration measurement device, belonging to the fields of inertia measurement technology and optical engineering. Four optical elements in the measurement device are arranged in a cross groove of an optical fiber fixing substrate respectively; transparent solution is capsulated in the crossing position of the cross groove; the output end face of the optical element is aligned with spherical particles in the transparent solution, the distance between output end faces of two opposite optical elements is between 50 and 800 microns; output ends of four monomode optical fibers are coupled in corresponding optical elements respectively, while input ends thereof are connected with a light intensity modulator; light emitted by a laser is modulated into four beams of light with the same light intensity through the light intensity modulator, and the four beams of light are input into the four monomode optical fibers respectively; an photoelectric image detector is arranged right above the cross position of the cross groove; and the photoelectric image detector and the light intensity modulator are respectively connected with a processor. The device has the advantages of even light intensity distribution and small radial gradient force, has high measurement sensitivity, and reduces the requirement on alignment accuracy of the beam.