This work focuses on a novel high-entropy alloy, ReMoTaW, with high density of 16.69 × 103 kg/m3. The high-entropy alloy displays three disordered solid solution phases. The phase segregation is explained by binary alloy phase diagrams and melting point temperature differences during non-equilibrium solidification. The maximum strength, failure strain and hardness are, respectively, 1451 MPa, 5.69% and 640 HV.