Habitat restoration is a crucial measure for conserving fishery resources and maintaining sustainable production. The habitat of juvenile in the Yangtze Estuary has been seriously degraded. In this study, the density, size composition, and growth characteristics of juvenile in artificial floating wetland (AFW) habitats were continuously monitored from May to November. The objective was to assess if juvenile select and use the AFW habitats, which will provide important information for future habitat restoration efforts in the Yangtze Estuary. The results show that the three-dimensional AFW habitats supported and a variety of aquatic organisms that lived symbiotically. Juvenile inhabited in the AFW habitat from June to October, and the highest density was 466.6 ind/m². However, the density decreased significantly with time (<0.05). There were differences in the size composition of larvae across months. Larvae with body weight <0.2 g were abundant in June and July, accounting for 98.1% and 66.0% of the total, respectively. Larvae weighing 0.2 g to 1.0 g were abundant in August, accounting for 84.7%. Larvae weighing 1.4 g to 1.8 g were abundant in September, accounting for 74.0%. The exponential value (2.3673; =0.9669) was 2.3673, indicating isometric growth (i.e., carapace length growing faster than body weight). The AFW provides an alternative habitat for juvenile , which meets the habitat requirements of hiding and feeding in the early development stages.