This study investigated the effects of moisture content and consolidation pressure on the dynamic properties and deformation behavior of intact loess under repeated cyclic loads. The British GDS bidirectional dynamic triaxial test system was used to simulate traffic loads, and a dynamic triaxial test was carried out on intact loess in Haidong area, Qinghai Province. The test results showed that under a single cyclic dynamic load, in the initial loading stage, the axial dynamic strain of intact loess significantly increased with an increase in the number of cycles; the increase rate gradually reduced, and the strain eventually became stable in the late loading stage. The moisture content and consolidation pressure had no significant impact on the axial dynamic strain of intact loess in the initial loading stage. However, when cycle number N exceeded 400, the axial dynamic strain of intact loess increased with an increase in moisture content and decreased with an increase in the consolidation pressure. With increasing number of cycles, the dynamic shear modulus of intact loess first decreased, then increased, and finally decreased; moreover, it significantly decreased with increasing moisture content. The dynamic damping ratio of intact loess first increased and then decreased with the increase in the number of cycles, and it increased with increasing moisture content. The test results showed that intact loess in Haidong area can easily undergo vibration deformation because of its large-void overhead structure.