The invention discloses a molten salt heat absorber inlet buffer tank with a filtering device. The molten salt heat absorber inlet buffer tank comprises a buffer tank body, a molten salt inlet pipe assembly, a molten salt outlet tube assembly and a molten salt bypass tube assembly, wherein the molten salt inlet pipe assembly is arranged on the buffer tank body. the molten salt inlet tube assemblycomprises a pipe seat, an inner extending connecting pipe and the vertical filtering device, the pipe seat is fixed on the buffering tank body, the two ends of the inner extending connecting pipe areconnected with the pipe seat and the vertical filtering device respectively, a molten salt filtering and distributing hole is formed in the side wall of the vertical filtering device, and a closed endis arranged at the bottom of the vertical filtering device. According to the molten salt heat absorber inlet buffer tank, a molten salt medium is subjected to flow distribution and filtration integrated treatment at the inlet of the buffer tank, and solid particles and impurities carried in the working medium can be effectively intercepted under the condition that molten salt flows; the problemsof molten salt working medium filtration purification and reasonable distribution can be effectively solved, the complex heat preservation of an external filter is also avoided, the problems that a heat tracing system is inconvenient to assemble and disassemble and overhaul are solved, and finally the purposes of saving investment and reducing maintenance cost are achieved.