Aiming at the technical problem of the traditional method of low working efficiency in fastening multiple screws, the invention mainly provides a device capable of simultaneously mounting and adjusting multiple screws and belongs to the technical field of mechanical assembly. With addition of multiple screw wrenches on a working mechanism of the device, multiple screws can be fastened by one operation only; and also with design of a torque adjusting knob, torsion values of the screws can be limited when the screws are fastened. The device has the advantages that the torsion values of all the screws can be set rapidly, multiple screws can be fastened or loosened by rotating one driving gear only, the fastening procedure can be simplified, the labor quantity of a worker is reduced, the working efficiency is improved, and the device is particularly suitable for being applied to places in which multiple screws are fixed and improves the production efficiency.