Exhaust brake valve and exhaust brake assembly

The exhaust brake valve comprises a driving side and a valve body side and comprises an electric driving device, a transmission device and an exhaust valve body, the transmission device comprises at least one pair of swing arms which are combined and transmitted through a connecting rod piece, in the two swing arms, the front-driving swing arm is driven by an output shaft to drive the connecting rod piece to swing, and the rear-driving swing arm is driven by an output shaft to drive the connecting rod piece to swing. The rear drive swing arm is driven by the connecting rod piece so as to keep linkage with the front drive swing arm; the exhaust valve body comprises an exhaust valve plate which is fixed with a driving shaft and can be controlled to turn over, the front-stage swing arm and an output shaft of the electric driving device coaxially rotate, the rear-stage swing arm and the driving shaft of the exhaust valve body coaxially rotate, and rotation of the output shaft is transmitted to the driving shaft a