The invention relates to an adjustable waist protector comprising two binding belts, two support assemblies, a first tightness adjusting assembly and a second tightness adjusting assembly. Each binding belt comprises a first terminal and a second terminal, and the first terminals of the two binding belts are opposite to each other and are spaced from left to right. The two support assemblies are respectively arranged on the two binding belts and are close to the first terminals, each support assembly comprises an upper terminal, a lower terminal and a plurality of guiding parts, and the number of the guiding parts is an odd integer. The first tightness adjusting assembly comprises a first stay cord, and the first stay cord penetrates through one support assembly and is wound on parts, of the guiding parts of the two support assemblies, being close to the upper terminals. The second tightness adjusting assembly comprises a second stay cord, and the second stay cord penetrates through the other support assembly and is wound on parts, of the guiding parts of the two support assemblies, being close to the lower terminals. Thus, the tightness degree of the upper half parts and the tightness degree of the lower half parts of the two binding belts can be adjusted respectively, and the two binding belts are actually affixed to the waist curve during the binding process.一種調整式腰部護具，包含兩條束帶、兩個支撐總成、一第一鬆緊度調整總成及一第二鬆緊度調整總成，各束帶包括一第一端及一第二端，兩束帶的第一端相對且左右間隔，兩個支撐總成分別設置於兩束帶上並鄰近於第一端，各該支撐總成包括一上端、一下端及多個導引件，導引件數量為奇數，第一鬆緊度調整總成包括一第一拉繩，第一拉繩穿設於其中一個支撐總成並纏繞在兩支撐總成的該等導引件中鄰近於上端的一部分，第二鬆緊度調整總成包括一第二拉繩，第二拉繩穿設於另一個支撐總成並纏繞在兩支撐總成的該等導引件中鄰近於下端的一部分。
