A granulator shear pin safety mechanism includes a shear pin housing disposed on a granulator frame or a gear box, a shear pin flange covered on an end surface of the shear pin housing, a shear pin disposed between the housing and the flange, a limit switch disposed on the housing, and a shear pin shroud hinged with the housing. The housing is penetrated by a main shaft of the granulator, the flange is connected to the main shaft, and the shear pin shroud covers a terminal of the main shaft. The limit switch is connected to a power control device. When the limit switch detects that a rotation displacement occurs for the flange, the power control device stops the granulator. A granulator shear pin safety mechanism have a two-piece shear pin shroud, suitable for a granulator having a remote roll adjust drive.
