The invention relates to a CD code/4-20ma current conversion output module. The CD code/4-20ma current conversion output module comprises a signal receiving part, a CPU processing and displaying part and a signal transmission part. The signal receiving part comprises a BCD input module and an isolating module which is in communication connection with the BCD input module. The CUP processing and displaying part comprises a CPU, a power supply and an indicator lamp, wherein the CPU is in communication connection with the isolating module, and the power supply and the indicator lamp are connected with the CPU. The signal transmission part is a 4-20ma current output module which is in communication connection with the CPU. A common signal conversion situation in a signal conversion device is modularized, the CD code/4-20ma conversion output module has the advantages of being small in size and convenient to install (can be installed on a guide rail of an existing cabinet), and when a transformer substation or new equipment of a power plant needs to have access to 4-20ma gear information and bcd output exists in an original gear output mode, the CD code/4-20ma current conversion output module can solve the problem and save cost.