To study the shear behavior of Ultra-high Performance Seawater Sea-sand Concrete （UHPSSC） beams reinforced with Fiber Reinforced Polymer （FRP） bars， the three-point bending loading test was used to explore the influence of shear span ratio， stirrup spacing and reinforcement type （CFRP， BFRP， HFRP） on the shear performance of FRP-UHPSSC beams. The test results showed that the cracks of FRP-UHPSSC beams developed rapidly during loading， and the beams had marked brittle failure characteristics. The mid-span load-deflection curves showed bilinear change before and after the first crack appeared. After the crack appeared， the slope of load-deflection curves became smaller， and the deflection growth speed increased. The shear capacity of FRP-UHPSSC beams decreased with the increase in shear span ratio and stirrup spacing. The cracking loads of test beams with the same shear span ratio were basically the same. The larger the elastic modulus of the reinforcement， the higher the shear capacity of test beams and the more vertical deformation is inhibited. Finally， the shear formulas of four codes are used for analyzing the test results. The minimum errors of the formulas for calculating the shear capacity of BFRP-UHPSSC beams and HFRP-UHPSSC beams are over 40% and 30%， respectively. The difference in the calculated shear capacity under the testing conditions of different reinforcement types varies greatly.