Powder coating for inner coating of conveying pipeline and preparation method of powder coating

The invention discloses a powder coating for an inner coating of a conveying pipeline and a preparation method of the powder coating. The coating is prepared from the following raw materials in parts by mass: 10 to 14 parts of 904 epoxy resin, 10 to 13 parts of 905 epoxy resin, 1 to 3 parts of rutile type titanium dioxide, 2 to 5 parts of chromium oxide green, 20 to 24 parts of superfine precipitated barium sulfate, 17 to 20 parts of NPCN-704 resin, 4 to 7 parts of BPANE8200H resin, 15 to 17 parts of KPH-F2003 phenolic resin, 3 to 6 parts of DER6508 resin, 0.1 to 0.3 part of a curing accelerator, 0.4 to 0.6 part of an isocyanate amino silane coupling agent and 0.5 to 0.7 part of a flatting agent. 0.2-0.4 part of elastic cement modified emulsion and 1-2 parts of A200 white carbon black. The technical scheme provided by the invention can be used in a high-temperature and high-pressure natural gas drilling environment containing H2S and CO2, has excellent corrosion resistance, effectively prevents pitting corros