The invention relates to the technical field of soil loosening, and discloses a soil loosening device matched with a mini-
tiller, which comprises a side plate, the end part of the side plate is connected with the mini-
tiller, one end of the side plate close to the mini-
tiller is rotatably connected with a main shaft, two ends of the main shaft are provided with walking wheels, one end of the side plate far away from the main shaft is rotatably connected with a rotating shaft, and the rotating shaft and the main shaft synchronously rotate. The device further comprises a soil loosening mechanism and a soil digging mechanism. The soil loosening mechanism is arranged on the side, close to the ground, of the side plate and comprises a cutter shaft rotationally connected with the side plate, and a plurality of soil loosening teeth are arranged in the middle of the cutter shaft; the soil digging mechanism comprises a cross rod fixedly connected with the side plates and a swing arm which deflects in a reciprocating mode with the cross rod as the center, and a rear throwing
shovel is arranged at the end, close to the walking wheels, of the swing arm. The back throwing
shovel which swings back and forth is additionally arranged on the front side of the advancing direction of the soil loosening teeth, the
operation mode of digging first and then smashing is formed, and the problems that traditional soil loosening teeth are difficult to penetrate into hard soil and slip and idle are effectively solved.