A handheld smart meter carrier module detection apparatus belongs to the technical field of electric power system detection, operation, and maintenance, including a chassis. A battery power supply system, a liquid crystal display module, a keyboard input module, a storage module, a clock unit, a power monitoring unit, a status parameter output unit, a direct current inversion alternating current module, a narrowband/wideband signal simulator, a signal modem module, and a core module are disposed inside the chassis. A liquid crystal display, a power switch, an alarm light, a frequency modulation knob, an adjustment key, a keyboard interface, and a power interface are disposed on the chassis. The invention uses a handheld and convenient structural design concept, maximizes a structural improvement, and rationally uses each inch of internal space. The detection apparatus can cover a fullband and effectively improve work efficiency, is portable, secure, and simple to operate, and can prevent a potential safety hazard of hot-line work.