The utility model discloses an integrative machine for cutting forage grass sheaf and crushing forage grass block, comprising a base, a casing, a forage grass block-crush part, a forage grass sheaf-cut part, a transmission part. The forage grass block-crush part and the forage grass sheaf-cut part are arranged in the casing and driven by the transmission part. A forage grass bloc inlet and a forage grass sheaf inlet are arranged on the front end of the casing and a forage grass bloc outlet or a forage grass sheaf outlet is arranged on the back end of the casing. The forage grass block-crush part comprises a main crushing roller and an arc secondary crushing part, wherein, a plurality of main crushing teeth are arranged on the main crushing roller and a plurality of secondary crushing teeth are arranged on the arc secondary crushing part. The forage grass sheaf-cut part comprises at least one pair of feeding cubing rolls arranged up-down and one pair of cutter rollers which are arranged on the back of the feeding cubing rolls up-down. The transmission part comprises a first motor and a second motor and the output shafts of the motors are connected with the forage grass block-crush part and the forage grass sheaf-cut part by own annular conveyor belts respectively. The utility model has the advantages of convenient operation, simple adjustment and reliable use.