The invention discloses a fingerprint unlocking device for a control box of an orchard conveyor. The fingerprint unlocking device comprises a fingerprint head waterproof housing, a single chip microcomputer, an optical-coupling relay, a circuit housing, a U-shaped iron plate bracket, a magnetic absorption sheet, a magnetic lock body and a power supply, wherein a fingerprint head is arranged in the fingerprint head waterproof housing, and is connected with a control system in the circuit housing through a serial port. Procedures in the single chip microcomputer realize recording and scanning fingerprints, and control the optical coupling relay fixedly arranged in the circuit housing, so that the magnetic lock body on the U-shaped iron plate bracket is controlled to attract the magnetic absorption sheet, and therefore, a control box door of the orchard conveyor is opened and closed. Compared with a conventional box door, the control box door does not need a key, so that unlocking time is saved, and safety and use conveniences of the control box of the orchard conveyor are greatly improved.