An agricultural soil improvement device comprises a box body, wherein a mixing device is fixedly connected to one side of the bottom of the inner cavity of the box body, the inner cavity of a fixing block is fixedly connected with a lifting device, and the bottom of the inner cavity of the box body is in sliding connection with a guide device at one side, far away from the mixing device, of the fixing block, one side, far away from the fixing block, of the lifting device is fixedly connected with a soil turning device, the middle of the top of the inner cavity of the box body is fixedly connected with a crushing device, and one end, close to the mixing device, of the lifting device is communicated with the mixing device. The bottom of one side, close to the lifting device, of the crushingdevice is communicated with the lifting device, and the device relates to the technical field of agriculture. By means of the device, soil can be turned up, the soil hardening degree can be reduced, and a soil conditioner can be crushed and prevented from damaging the soil due to bulk deposition of the conditioner, so that the conditioner and the soil are fully and uniformly mixed, the soil is refined, the oxygen is fully absorbed, the oxygen content of the soil is ensured, the soil is improved, and the device is beneficial to agricultural planting.