The present disclosure relates to an emergency stop method for hybrid construction equipment and a brake control device, and more particularly, to an emergency stop method for hybrid construction equipment and a brake control device, which may confirm a failure occurrence location of the hybrid construction equipment, absorb inertial energy of the swing body using several functions for each generated failure location so as to stably stop the swing body in an emergency manner, and when the failure occurs in the hybrid construction equipment, create the brake pattern by using the swing speed or the front information, control a brake of the swing body by controlling a voltage control valve or a hydraulic valve in accordance with the created brake pattern, such that a user may smoothly stop the swing body in accordance with a desired stop speed profile.