This study investigated the correlation between parents' nutrition quotient (NQ) and the nutrition quotient of Korean preschoolers (NQ-P) of picky eaters (PE) aged five years living in Dobong-gu, Seoul. The questionnaire was conducted online by parents of 187 preschoolers between May 25 and June 5, 2020. PE was defined as an average score of 3 or more on the picky eating questionnaires; non-picky eaters (NPE, n=120) and PE (n=67). The correlation between preschoolers and their parents was assessed using the NQ-P and NQ, respectively. Compared to the NPE, picky eating (p<0.001) was significantly higher, and vegetable preference (p<0.001), NQ-P (p<0.05), moderation dimension (p<0.05), frequency of vegetable intake (p<0.05) of balance dimension, and processed beverages (p<0.01) of moderation dimension were significantly lower in the PE. The correlation between the NQ and NQ-P was related to the diversity (p<0.05), moderation (p<0.05), and environment (p<0.01) of NQ in the NPE and not related to the PE. PEs should increase their frequency of vegetable intake and reduce their intake of processed beverages. To increase the NQ-P of PE, parents should eat a balanced diet. Future studies on the NQ-P of preschoolers aged 3 to 5 are needed.