A demolition robot (1) comprises a robot arm (2) and a saw tool (3) having an exchangeable saw blade (5), wherein the saw tool comprises a rotatable spindle (4) with an end portion (4.1) and a saw blade comprising a hub (6), and the saw blade hub is releasably arranged on the end portion (4.1) of the spindle with a torque-transmitting connection (7), and wherein a release mechanism (30) for automatic exchange of the saw blade (5) is arranged on the robot arm.