Due to the increasing applicability of Carbon nanotubes (CNTs) in various technological fields, processing of CNT composites to the desired size and shape is a critical issue. However, CNT composites are hard and brittle materials unsuitable for machining or pressing.  In this regard, pulsed lasers offer incredible advantages. Nonetheless, laser processing of CNT composites is restricted to micro-scale applications, and it's not understood at the macro level in treating a bulk CNT composite. Therefore, this paper aims to make a clear understanding of laser interaction with CNT composite plate, experimentally, using pulsed nanosecond laser, as a critical step towards creating laser structured micro-channels on CNT bipolar plate for PEMFCs (Proton Exchange Membrane Fuel Cells). Penetration depth, top width, and overall morphological observations on the behavior of ablated region and base material are considered response variables. SEM and 3D Scanning Confocal Microscope were used for measurements and physical observations. Additionally, EDX and Vickers hardness testing are used for chemical and mechanical characterizations.  According to the results, the effect of the number of passes is the highest on controlling penetration depth and top width. Power and scanning speeds result in a relatively smooth operation without major effects on the physical morphology. Pulse repetition rate presents a unique nature of interaction that resulted in a critical repetition rate distinguishing three different regimes each with certain distinct chemical and mechanical behaviors. Overall, results suggest that laser processing can be considered a potential method for manufacturing flow channels of bipolar plates using CNT composite materials.