The invention discloses a fireproof floating marine work suit based on HGM/ER, belongs to the technical field of public safety, and is suitable for maritime employees in complex environments such as fire disasters, drowning and the like. The work suit comprises a clothes part, a trouser and shoe part and a helmet part. A core material of a main body structure of the work suit is mainly a composite foam material composed of hollow glass beads and epoxy resin, and the work suit is composed of an outer layer, a middle layer and an inner layer, namely an aluminum foil composite flame-retardant outer layer with flame-retardant, heat-insulating and high-temperature-resistant performance functions, a composite foam material middle layer with low density, a low water absorption rate, excellent buoyancy, impact resistance, high compressive strength and low thermal inertia, and a comfortable inner layer which is low in water absorption rate and capable of further buffering external impact on the human body and improving the comfort level of a wearer. The work suit has the advantages of high temperature resistance, heat insulation, buoyancy providing, impact resistance, compression resistance and reduction of heat loss of a wearer in a water environment.