Controller with multiple installation modes

The utility model discloses a controller with multiple installation modes. The controller comprises a controller body. A plurality of through holes or threaded holes are formed in the controller body, and bolts can penetrate through the through holes or the threaded holes and are in threaded connection with the mounting positions; a clamping groove and an adjusting groove communicated with the clamping groove are formed in the controller body, a locking position and an unlocking position are arranged on the side wall of the adjusting groove, a clamping piece located at the locking position or the unlocking position is arranged in the adjusting groove, a guide rail is arranged in the clamping groove, and the clamping piece can abut against the guide rail when located at the locking position so as to limit the guide rail to be disengaged from the clamping groove; or the clamping piece can be far away from the guide rail when in the unlocking position, so that the guide rail can be separated from the clamping gr