An electric transplanter and an electric power supply method. The electric transplanter comprises at least one power supply device (20) and a transplanter device (10); the transplanter device (10) comprises a transplanter body (11), at least one accommodating body (13), and at least one holding unit (14); the accommodating body (13) is disposed on the transplanter body (11), and has an accommodating space (131) and an opening (132) communicated with the accommodating space (131); the power supply device (20) is detachably mounted in the accommodating space (131) through the opening (132) of the accommodating body (13); and the holding unit (14) is held at the opening (132) of the accommodating body (13) to prevent the power supply device (20) from falling out of the accommodating space (131) from the opening (132) of the accommodating body (13), so as to ensure the reliability and stability of the electric transplanter during use.
