The invention relates to the field of composite materials and may be used for preparing parts and structures to be used in aviation and rocket/space technology medicine automobile manufacturing etc. A composite reinforcing thread contains a roving made of reinforcing fibers saturated with a thermoreactive binder having a cross-section in the form of a circle with a diameter of 0.1-0.7mm or in the form of an ellipse with an eccentricity of 1-2 and a larger diameter of 0.1-0.7mm. The saturated roving is subjected to temperature processing until the thermoreactive binder is fully set. A prepreg is produced from the thread by adding a thermoplastic binder. A tape is produced by connecting a thread or prepreg by means of connection elements made of a thermoplastic material. The thread is produced in an installation containing a bobbin creel onto which is installed a bobbin with a roving made of reinforcing fibers or reinforcing fibers and functional fibers a saturating device two thermal processing chambers a unit for receiving finished thread and a receiving bobbin. The temperature is 70-130DPIIT癈 in the first chamber and 160-400DPIIT癈 in the second chamber. In order to prepare the prepreg the installation is additionally provided with a device for applying a thermoplastic coating onto a roving which is saturated with a thermoreactive binder and fully cured. The invention allows for reducing the difficulty of preparing parts with a thermoplastic matrix and reducing the duration of product preparation; for increasing the storage life of an initial prepreg and for increasing the effectiveness of preparing products from composite materials.