The invention discloses an electronic current transformer laser energy supply self-diagnosis method. The method comprises the following steps that a merging unit monitors a pipe core temperature and a driving current of a laser and acquires monitoring data, wherein the monitoring data includes the pipe core temperature and a driving power value corresponding to the driving current; and the monitoring data is compared to a repairing alarm value and a maintenance alarm value which are arranged in advance and correspond to different temperatures, self-diagnosis information is acquired and transmitted to a control bench, wherein the self-diagnosis information includes normal work information, repairing alarm information and maintenance alarm information. The invention also discloses an electronic current transformer laser energy supply self-diagnosis system. The system comprises the control bench, the merging unit and an acquisition unit. The method and the system of the invention have an advantage that according to output power, a temperature and the driving power value of a laser energy supply loop, the laser energy supply loop carries out self diagnosis so that early warning of a laser energy supply portion in a defect initial stage is realized and timely repairing and processing are realized too.