Mobile geomagnetic vector data from 2016 to 2021 and MS≥3.0 earthquakes from 2017 to 2022 are used to quantify and statistically analyze the seismomagnetic characteristics of moderate-small earthquakes in Hebei and adjacent areas based on annual variations of the lithospheric magnetic field. Based on the results, epicenters are predominantly distributed near zero-variation lines of magnetic declination (D), inclination (I), and total intensity (F) with 75.0%, 50.0%, and 46.4% of earthquakes located ≤50 km from D, I, and F zero-variation lines, respectively. This is the most significant correlation for magnetic declination. Statistical analysis of three-component variations reveals that the maximum amplitudes of D, I, and F at the epicenters are 1.37′, 0.69′, and 8.52 nT, respectively. Specifically, 60.7% of epicenters exhibit a D variation within ±0.40′, 60.7% show an I variation within ±0.25′, and 75.0% display an F variation within ±3.50 nT. No epicenters coincide with the extremum zones of these components. The values of the vector modulus and horizontal vector modulus at epicenters are broadly distributed, while a relatively high proportion of epicenters correspond to smaller values. Finally, scatter plots of the magnitude versus lithospheric magnetic field variations at epicenters and the subsequent calculation of correlation coefficients demonstrate no significant correlation between the earthquake magnitude and these parameters.