The global consensus on the utilization of wind energy as a renewable resource has led to the progressive scaling up of wind turbine systems, necessitating the development of lighter and stronger wind turbine blades. Pultruded planks have been increasingly adopted for the main beams of blades, attributed to their superior mechanical properties, high production efficiency, and ease of assembly. However, the application of pultruded planks in complex structural configurations, including splicing, stacking, and variable width, has resulted in multiple failure modes, such as severe deformation, interface delamination, and brittle fracture under bending loads. These issues critically impact the mechanical performance of wind turbine blades and represent a pivotal challenge in structural design. Respecting the authentic structural forms and layers, this study conducted a comprehensive series of static tests to evaluate the performance of pultruded planks laminated structures, including two-layer longitudinal splicing seam cap components, three-layer transverse splicing seam cap components, and width-variable components. The experimental outcomes provided detailed analyses of the stress-strain characteristics, deformation behaviors, and failure mechanisms observed during axial bending, axial tension, chord-wise tension, and chord-wise bending tests. The findings from this research were expected to significantly enhance the design methodologies employed in the construction of wind turbine blades, thereby contributing to the field's advancement.