In order to enhance service availability and improve system performance, it is necessary to configure multiple HAs on the home link and efficiently balance load among these HAs. This paper proposes the Home Agent Load balancing method based on Active Overload Prevention (HALAOP). HALAOP actively selects optimal HA for each registration request to prevent HA’s overload in advance, rather than just passively switching load between HAs like previous methods. HALAOP introduces a dynamic load evaluate algorithm to provide the basis for optimal load balancing decision. In addition, the load slicing mechanism is introduced to eliminate unnecessary additional overhead. The results of numeric analysis show that HALAOP can be more efficient in reducing probability of registration failure due to HA’s overload and registration delay at lower additional cost than previous methods.