Abstract: In order to study the effect of low temperature on bending property of modified aggregate-steel fiber recycled aggregate concrete, the replacement rates of 30wt% and 60wt% recycled aggregate were set, mixed with appropriate amount of steel fiber to make cement recycled aggregate concrete (CRAC), temperature gradients of 20℃, 0℃, −20℃, −40℃ and −60℃ were set in the cold area of northern China. CRAC was subjected to compressive strength and four-point bending performance tests by low-temperature action, and its equivalent bending strength and bending toughness were analysed, together with SEM to reveal its macroscopic performance change mechanism from the microstructure perspective, on the basis of which an expression for the fibre reinforcement effect of recycled concrete under low-temperature was proposed. The test results show that after low temperature treatment, the flexural strength of CRAC is significantly increased by 168%, respectively. With the further decrease of temperature, the bending property of 60wt% CRAC is better than that of 30wt% CRAC. At the same time, CRAC with 1.5vol% steel fibres has the best strength and toughness properties at low temperatures. The conclusion of the study is expected to provide reference for the performance design and application of recycled concrete in low temperature environment.