The invention discloses a control system with braking function of series excited direct current cross-connected double motor used for electric motor cars, which is characterized by comprising a core cell microcontroller (MCU), a complete signal inputting and conditioning circuit, an output executive circuit, a fault display circuit, an input-output isolating circuit, a power electronic switch, a drive circuit thereof and the like; two series excited direct current motors are crossly connected, namely the single motor self is serially excited and two motors are connected in parallel; the main circuit connection driven by the motors consists of two current fly-wheel diodes, four power switch electronic devices, two contactors, etc. The motor connection mode, main circuit and controller disclosed in the invention can realize the functions of motors of rotating the motors normally and reversely, starting current limit, regulating speed, braking, etc. The motors can realize regenerative braking and has high efficiency, and the whole system has characteristics of perfect control functions, high reliability and the like.