Polypropylene fiber（PPF） was employed to toughen and reduce the brittleness of coral concrete. The results indicate that by appropriately increasing the content or length of PPF， the flexural and tensile strength of coral concrete can be significantly enhanced to a certain extent. However， if the length of PPF is too long or the content is too large， the curling or clustering of PPF may cause local defects in coral concrete， thereby reducing the toughening effect. The tensile stress-strain curves of PPF-reinforced coral concrete conform to the trilinear constitutive model， with the ultimate tensile strain increasing by 52% to 333%， and the ductility index reaching as high as 10.89. Although PPF can significantly improve toughness， it may also lead to a reduction in the density and compressive strength of coral concrete. Therefore， in practical applications， it is suggested to consider the negative effects brought about by PPF reinforcement in a comprehensive manner and make appropriate adjustments. Therefore， in practical applications， it is recommended to precisely control the content and length of PPF to ensure that the coral concrete not only gains the necessary increase in toughness but also retains suitable levels of compactness and compressive strength.