For improving the utilization rate and production efficiency，large petrochemical wharves often have a wide range of berthing and concurrent berthing ship types，i.e.，there are many types of ships served by the wharves and there are large differences in ship tonnage and ship size. When the auxiliary berthing facilities are not arranged properly，small ships may get stuck or sway，tilt or even roll over under the action of strong wind and waves，which is very easy to cause berthing accidents and seriously affects the safe operation of the wharf production system. Based on the actual case，this paper expounds the safety hazards and rectification and maintenance scheme for the large petrochemical wharf with small ships. The engineering practice shows that on the premise of ensuring the integrity of auxiliary berthing facilities，the safety hazards of small ships berthing can be eliminated by increasing the horizontal berthing point and the layout range of vertical rubber fenders or limiting the scale of berthing ship type.