Tobacco block pre-loosening device

The utility model discloses a tobacco block pre-loosening device which comprises a fork knife mechanism which comprises a first conveying device, a cover body arranged on the first conveying device and a fork knife assembly arranged on the cover body. The cigarette block height detection device is arranged at the feeding end of the cover body and used for detecting whether the height of the cigarette blocks on the first conveying device exceeds a preset height or not; the pushing device is arranged in the cover body, and the pushing device is located between the tobacco block height detection device and the fork knife assembly in the conveying direction of the first conveying device; the control device is respectively connected with the cigarette block height detection device and the material pushing device and is used for judging whether the height of the cigarette block detected by the cigarette block height detection device exceeds a preset height or not, and when the height of the cigarette block detected