The invention relates to the field of aviation, and more particularly to systems for controlling rotor blades. A swashplate for a multi-rotor aircraft with rigidly mounted blades consists of a base, to which is bolted an inner mast having a supporting rotating cylinder mounted thereon with the aid of journal bearings and a thrust bearing. Fastened to the outside of the cylinder is a driven gear, to which energy is supplied from an engine via a drive shaft with a drive gear. A separate actuator is provided for controlling the blocking of the rotation of the supporting rotating cylinder. Inside the mast is a threaded collective pitch control shaft having on its lower part a worm gear and a worm shaft that extends from an electric motor with a reduction gear. During rotation of the threaded shaft, the threaded portion raises or lowers an L-shaped collective pitch control slider. A rotating race also transmits a control action via ball joints and rods to the blades, which are fastened to the supporting rotating cylinder via combined journal and thrust bearings, between which a blade rotation assistance mechanism is disposed.