Novel double-beam portal crane

The invention discloses a novel double-beam portal crane. The novel double-beam portal crane comprises a crane body, the crane body comprises two connecting steel frames, and a supporting mechanism isarranged between the two connecting steel frames. According to the novel double-beam portal crane, a connecting sliding plate penetrates through the interior of a first sliding groove, a supporting plate slides through the first sliding groove according to the use position of a flat plate sliding mechanism, a threaded hole in the corresponding position is selected, and a threaded rod is used forfixing the position of the supporting plate; a power rod is rotated through a first bearing according to the length of a flat plate steel frame, the power rod drives a control screw rod to rotate through a second bearing, a moving block is driven to move reversely while the control screw rod rotates, a first buffer plate and a second buffer plate are driven to be slidably adjusted in a second sliding groove through a fixin