. Mental retardation is a condition of mental development stalled or incomplete, which is mainly characterized by the presence of obstacles during the development of skills, so the effect on the level of intelligence is the ability of cognitive, language, motor and social. Development of socialization skills mentally retarded child is strongly influenced by social media, especially the role of parents is very influential in the social development of children who have mental retardation. This study aims to determine the relationship with the parent role socialization skills in children with mental retardation SDLB Pekalongan. This study design using correlative descriptif with cross sectional approach. The sampling technique using saturated sample. The number of respondents as many as 49 parents of children with mental retardation in accordance with the inclusion and exclusion criteria. The results using Chi-Square test obtained value of ρ value = 0.0001 (ρ <α or ρ <0.05) and the value of OR = 17.81, indicating the existence of a relationship with the parent role socialization skills in children with mental retardation SDLB Pekalongan , The role of a good parent can increase the ability of socialization of children with mental retardation. Parents as the nearest person in a child's life can help a child with mental retardation in adjusting to the environment.