To address the issues of complex principles, high cost, and unsuitability for classroom demonstration in traditional energy analyzers, this paper presents a symmetric energy analyzer specifically optimized for teaching scenarios, based on the parabolic motion model in a uniform electric field. COMSOL simulation results verify that the analyzer achieves an energy resolution of 1.29% while offering a broad voltage scanning plateau and a large divergence halfangle tolerance of ±0.212°. Featuring a simple structure, adjustable energy range, and support for lowvoltage operation, the device is suitable for teaching demonstrations and basic measurements related to electromagnetic fields and charged particle motion in secondary schools and universities. It provides an effective solution for developing lowcost, highsuccessrate physics teaching instruments.