The invention discloses an adjustable plate perforating device. The adjustable plate perforating device comprises a machine body, wherein first sliding grooves are symmetrically formed in the end surfaces of the front top and rear top of the machine body; the interior of each first sliding groove is connected to a clamping mechanism with the top sticking out of the end surface of the top of the machine body in a sliding fit manner; a first screw hole which extends left and right is formed in the clamping mechanism located in the first sliding groove; a first sliding cavity is formed in the clamping mechanism above the first screw hole; a first transmission cavity is formed in the top of the first sliding cavity in a connection manner; the interior of the first sliding cavity is in slip connection with a sliding block; a clamping sliding groove is formed in the end surface of the right side of the clamping mechanism located at the right side of the first sliding cavity; the interior ofthe clamping sliding groove is in slip connection with a push block; a locking motor is fixedly arranged in the end surface of the top of the sliding bock; the top of the locking motor is connected toa first conical wheel extending to the interior of the first transmission cavity in a matching manner; and a second transmission cavity is arranged in the clamping mechanism located above the left side of the first transmission cavity. The adjustable plate perforating device is simple in structure, time-saving and labor-saving, is less likely to cause a deviation and improves production efficiency.