The invention discloses a multifunctional plate bending machine with a plate shearing mechanism. The multifunctional plate bending machine with the plate shearing mechanism comprises a plate bending mechanism and the plate shearing mechanism. The plate bending mechanism comprises a left supporting pillar, a right supporting pillar, a first horizontal fixed beam and a second horizontal fixed beam. The plate shearing mechanism comprises a cross shearing cutter and a auxiliary shearing cutter, wherein the cross shearing cutter is rotationally arranged on an I-shaped beam and can rotates around a rotary shaft of the cross shearing cutter to abut against the bottom wall of the I-shaped beam; the auxiliary shearing cutter is rotationally arranged on the second horizontal fixed beam or rotationally arranged on the left supporting pillar and the right supporting pillar and can rotate around a rotary shaft of the auxiliary shearing cutter to abut against the second horizontal fixed beam. The position is a shearing position, and at the time a V-shaped blade groove opening of the auxiliary shearing cutter is upward. The auxiliary shearing cutter further rotates to the front side of the second horizontal fixed beam, and the position is a storage position. The multifunctional plate bending machine with the plate shearing mechanism achieves multiple functions in one machine.