In recent years, pultruded profile structures have gained increasing attention and applications, but many studies have also indicated that the joints are one of the key issues, facing problems such as low strength utilization, low stiffness, and diverse failure modes. To address this issue, this work proposes two novel connection methods using CFRP bars reinfored UHPC block and welded steel sleeve. 3D-printed molds can assist in the shaping of UHPC, producing UHPC blocks with predrilled holes and complex shapes for subsequent installation. Meanwhile, welded steel tube connection joints are a type of connection that has shown good performance in existing research. In this work, the connection configurations are described in detail firstly, followed by finite element analysis. The results indicate that the UHPC block connection has high initial stiffness and ultimate moment, with the UHPC reaching its tensile strength first during loading, followed by flange-web junction failure of the FRP column. The welded steel sleeve connection demonstrates excellent ductility, maintaining significant moment after the steel sleeve yields. Both connections are classified as semi-rigid and partial strength joints. The UHPC block connection can achieve 67% of the full-section moment of the FRP beam, while the welded steel sleeve connection can reach 35%. This study validates the mechanical performance of these two connections, which offer the advantages of prefabricated installation and simple construction, showing promising application prospects.