A multi-robotic arm apparatus for intraoperative radiotherapy is provided. The apparatus may comprise a chassis, a main robotic arm mounted on the chassis for moving a radiation head installed at an end thereof, a first robotic arm mounted on the chassis having a first robotic arm end gripper for gripping an imaging device or a treatment applicator; and a second robotic arm mounted on the chassis having a second robotic arm end gripper for gripping a simulation applicator.