The invention relates to an electro-mechanical line-control brake. The electro-mechanical line-control brake comprises a motor, a transmission mechanism, a drive rod, a driven rod, a piston, a roller,a friction limiting device and the like, wherein the motor drives the drive rod to rotate through the transmission mechanism, and drives the driven rod to move through the roller between the drive rod and the driven rod and a groove, so that the piston and a brake clamp body move in reverse directions, and a friction plate is pressed with same force from the two sides of a brake disc, and therefore, the efficient brake effect is realized. The elector-mechanical line-control brake is simple in structure, is reliable in work, is high in brake efficiency, can automatically regulate a brake gap,compensates influences caused by abrasion of the friction plate, simplifies the design of a control system, and can be used for travelling brake and parking brake.