Leakage-proof device of concrete mixer truck

The utility model discloses a leakage-proof device of a concrete mixer truck, which comprises the mixer truck, a mixing box is arranged on the right side above the mixer truck, the mixing box is electrically driven to rotate to ensure that concrete in the mixing box is not solidified, a discharge port is arranged below the left side of the mixing box, and a collecting tank is arranged above the mixer truck. The collecting tank is placed below the stirring box and the discharging port, and a driving device is arranged on the right side of the collecting tank. The driving motor drives the driving shaft to rotate, the connecting block drives the sliding rail to slide, rotation is converted into linear motion through the driving shaft, pushing of the pull rod and the scraping plate is achieved, and reciprocating motion of the scraping plate is achieved through alternate rotation directions of the driving motor. According to the concrete storage device, concrete dripped from the stirring box and the discharging po