The invention discloses a pull-riveting detection device for a workbench for left and right supporting frameworks of heavy-duty trucks. The device comprises a rack; a horizontal operation surface is arranged at the top of the rack; a turnover positioning fixture is arranged on the horizontal operation surface and comprises a frame body; multiple groups of positioning clamps are perpendicularly arranged on the frame body; multiple groups of detachable pull-riveting nut detection frames are further arranged on the horizontal operation surface; and each detachable pull-riveting nut detection frame comprises a detection support perpendicular to the horizontal operation surface, a trigger block support is horizontally arranged at the top of the detection support, a trigger block is arranged on the trigger block support, an elastic trigger point of the trigger block faces upwards, and a proximity switch in signal connection with the trigger block is arranged on one side of the trigger block support and is in signal connection with a pull-riveting nut detection display system. The device ensures that all pull-riveting nuts can be punched into front and back surfaces of the left and right supporting frameworks of the heavy-duty trucks, so that the assembly quality of the left and right supporting frameworks of the heavy-duty trucks is reliably guaranteed.