The invention discloses a washing powder plastic bag manufacturing machine and relates to the field of plastic machinery. The washing powder plastic bag manufacturing machine comprises a case; a motor is disposed at one end of the case and connected with a runner; the runner is connected with a pulling roller through a belt; a charging rack is disposed at the upper end of the case and connected with a feed roller; a length adjusting rod is disposed beside the feed roller; an electromagnetic heater is disposed beside the length adjusting rod; a cutter is arranged beside the electromagnetic heater; the pulling roller is disposed beside the cutter; the pulling roller is connected with a discharging device through a belt; the electromagnetic heater comprises an upper electromagnetic induction heating roller and a lower electromagnetic induction heating roller which are symmetrical, the electromagnetic heater makes the heating rollers to be self-heated by means of an electromagnetic induction principle, and advantages of low heat loss, short pre-heating time and energy and electricity saving are achieved. The washing powder plastic bag manufacturing machine is reasonable in structure, practical, convenient and suitable for being applied and popularized.