The utility model relates to an electric cropper. A reel portion (31) is arranged on the left side or the right side of a machine body (11), and a relay component (42) which can be inserted into and detached from a power supply on/off key (41) is arranged on the other side of the machine body (11). The relay component (42) is arranged among a battery (26) which is driven by a motor, and control portions (24, 64), and thus the battery (26) can be electrically connected with the control portions (24, 64) through inserting the power supply on/off key (41) into the relay component (42), and the battery (26) can be detached from the control portions (24, 64) through pulling the power supply on/off key (41) out of the relay component (42).