In order to investigate the effect of SBR(styrene butadiene rubber) latex on modified emulsified asphalt, the penetration, softening point, ductility and storage stability tests were carried out on modified emulsified asphalt with different SBR latex contents. The dynamic shear rheometer(DSR) and bending beam rheometer(BBR) were used to test the effect of SBR Latex content on the high and low temperature performance of modified emulsified asphalt. The results show that with increase of the content of SBR latex the ductility, softening point of the modified emulsified asphalt residue gradually increase but the penetration reduces at the same temperature, the complex modulus, rutting factor and creep rate gradually increase with the increase of SBR latex content, while the stiffness modulus and phase angle decrease. Considering the influence of SBR latex content on various performance indexes of modified emulsified asphalt, it is recommended that the appropriate content of SBR latex is 4%.