This paper addresses the optimization needs of the drilling and grinding process for drillable composite bridge plugs by designing and building a horizontal drilling and grinding test system. The system integrates a screwing unit, rotary fluid passage device, pull-out test frame, hydraulic system, and control system, aiming to achieve the disassembly, maintenance, pull-out, and pressurized rotation processes of downhole drilling tools. Through simulated research conducted on this system, it can effectively support the optimization design of drilling and grinding process parameters for horizontal-well drillable composite bridge plugs, providing experimental basis and technical support for practical engineering applications. The research in this paper not only improves the drilling and grinding efficiency of drillable composite bridge plugs, but also provides valuable experimental technical support for process improvements in related fields.