Abstract: In view of the fact that the mining robot drives the robot to walk by virtue of the friction force generated between its walking mechanism and the contact surface of the seabed, at the same time, the walking mechanism will inevitably cause damage to the benthic microorganisms on the seabed, correspondingly, the larger the seabed area disturbed by the walking mechanism. It is bound to cause damage to more benthic organisms. The foot-type deep-sea mining robot proposed in this paper is especially suitable for the mining of deep-sea polymetallic nodules with hard seabed. It can drive the mining vehicle robot to walk through the limited contact area with the seabed, reducing the impact on the benthic organisms. At the same time, the collection mechanism equipped with grabbing and pumping can not only reduce the disturbance to the benthic organisms on the bottom of the sea, but also only mine polymetallic nodule ore of suitable particle size, reducing the disturbance and damage to the environment of the entire mining area. Subsequent development of deep sea mining provided a viable mining device.