The invention discloses a small dual single-pole double-throw coaxial electromechanical switch comprising a control circuit assembly, a relay assembly, a microwave signal transmission channel assembly, and a shell. The relay assembly is formed by combining relay assemblies of two single-pole double-throw switches. The microwave signal transmission channel assembly comprises a cavity assembly and a mounting board assembly, the mounting board assembly is formed by combining mounting board assemblies of two small single-pole double-throw switches, and the cavity assembly is formed by combining cavity assemblies of two small single-pole double-throw switches. The electromechanical switch of the invention adopts a relay assembly combination structure and a microwave signal transmission assembly combination structure, is integrated with two small single-pole double-throw switches which can be regarded as a small switch matrix, and can achieve the functions of a variety of forms of switches. A smaller dual switch is achieved, and the minimum size of the dual single-pole double-throw coaxial electromechanical switch can be 22.2mm*33.8mm*57.2mm.