Straw smashing device

The utility model relates to a straw smashing device which comprises a supporting frame and a feeding shell, the supporting frame is installed on external equipment, the feeding shell is installed on the supporting frame, a lubricating mechanism and a pressurizing mechanism are arranged on the supporting frame, and the lubricating mechanism comprises a synchronizing shaft, a transmission shaft, a synchronizing wheel, a transmission wheel, a one-way pipe, a contact head, an oil baffle plate, a guide rod, a compression spring and a guide sleeve. The synchronizing shaft and the transmission shaft are rotationally connected to the supporting frame, lubricating oil in the one-way pipe flows into the driving wheel and the synchronizing wheel along the oil blocking groove so as to lubricate the driving wheel and the synchronizing wheel, and after meshed gears rotate, the oil blocking plate and the oil blocking groove continue to be sealed under the action of the compression spring; therefore, lubrication can be carr