The invention discloses a control circuit and an engineering maintenance vehicle for emergency braking when a rail vehicle is reconnected; the control circuit includes adding a first switch to the safety interlocking loop of the engineering maintenance vehicle as the main control locomotive, and controlling the on-off of the first switch by detecting the state of the loop in which the emergency triggering device of the other vehicle as the non-main control locomotive is located, thereby realizing the on-off of the safety interlocking loop. This shows, the above method, the emergency stop signals of other vehicles can be transmitted to the safety interlocking loop of the main control locomotive and the emergency stop signals of other vehicles can be transmitted to the safety interlocking loop of the main control locomotive, so as to realize the emergency braking through the safety interlocking circuit of the main control locomotive, effectively solve the complex operation marshalling can only be controlled by the main control locomotive marshalling emergency shutdown and the resulting security risks, so that the entire operation marshalling can control and ensure the emergency shutdown of locomotives in the emergency, and improve the safety and reliability of the operation. In addition, the engineering maintenance vehicle provided by the present invention also has the above effects.