The invention relates to a scale-inhibiting type horizontal pipe falling-film evaporator. A film-scraping assembly is arranged on an evaporator pipe bundle and is driven by a film-scraping power assembly. The film-scraping assembly comprises a scraping card and a card groove; the scraping card comprises a clamping ring; the clamping ring is integrally connected with a card seat plate through a card seat; a T-shaped groove is processed in the upper end face and/or lower end face of the card groove; the card seat plate is embedded in the T-shaped groove, so that the scraping card and the card groove form the film-scraping assembly; the two ends of a plurality of film-scraping assemblies are arranged on film-scraping assembly fixing columns, so that the card rings at the upper and lower positions surround a heat exchange pipe of the evaporator, and the upper end and the lower end of the film-scraping assembly and screw rods are in threaded transmission; the screw rods are arranged at the upper end and the lower end of a fixed pipe plate of the evaporator pipe bundle. In the film scraping process, double effects of eliminating deposition and secondary film distribution are realized, equipment dry burning caused by scaling and non-uniform film distribution can be avoided, the limitation of the conventional falling-film evaporator on treatment objects is overcome, and the film-scraping assembly is particularly suitable for high-viscosity and high-solid-content occasions liable to crystallization and scaling.