With the utilization of wind energy as a renewable resource becoming a global consensus, the requirements for the performance of wind turbine blades have also increased. Pultruded planks are widely used in the main spar of wind turbine blades in the form of laminated structures because of the prominent mechanical properties and assemblability. Pultruded planks laminated structures have complex structural forms and layers, such as splicing, stacking, chamfering, etc., resulting in variable failure modes. However, traditional design methods tend to simplify the laminated structure into a single-layer structure or define a strength reduction factor to ensure safety and reliability. However, this method cannot effectively explain the real failure mechanism and interface behavior cannot be ignored. In this study, specimens of glass fiber and carbon fiber pultruded planks laminated structures were manufactured and quasi-static tensile tests were carried out on the premise of respecting the real lay-up in the main spar of wind turbine blades. Based on the load response, displacement response, crack initiation and propagation, the tensile properties and failure mechanism of pultruded planks laminated structures are obtained, which could provide a reference for the design and application of these structures.