Sludge loosening device of underwater dredging robot, and underwater dredging robot

The invention provides a sludge loosening device of an underwater dredging robot. The sludge loosening device of the underwater dredging robot comprises two symmetrically arranged transverse L-shapedsupport frames, a hollow transmission protection shell arranged between the two support frames and with two ends fixedly connected with the hollow transmission protection shell, and a first transmission shaft penetrating through the transmission protection shell and connected with the two end walls of the transmission protection shell through a first bearing; two first rake tooth seats respectively corresponding to the two support frames are symmetrically and fixedly connected to the first transmission shaft, and the first rake tooth seats are annularly provided with first rake teeth; at leastone first bevel gear is connected to the first transmission shaft in the transmission protection shell in a matched mode, and at least one second transmission shaft is connected to the bottom of thetransmission protection she