The invention relates to the technical field of engineering construction materials and especially relates to a compound waterproof joint sealant containing a water-bearing hyperbranched emulsion. The compound waterproof joint sealant is composed of an adhesive tape and a water-based adhesive, wherein the water-based adhesive contains emulsified asphalt, an EVA emulsion, silicon acrylic emulsion, water, filler, a dispersing agent, a thickening agent, a UV absorbent, a mold inhibitor and a water-bearing hyperbranched emulsion. The water-bearing hyperbranched emulsion has the characteristics of three-dimensional netted structure, more branches, more active points, a large quantity of active groups and ultrahigh chemical activity, so that the caking property and resilience of the joint sealant can be increased and the joint sealant is environmentally friendly; the joint sealant can be used for construction under water condition, and the harmful effect of bad weather to construction can be reduced; on-site heating is not required in a construction process; the construction is quick, convenient and safe; the manufacturing cost is low; the manufacturing is environmentally friendly.