The utility model provides a bituminous mixture density testing device, includes curing means, the balance that soaks, linking bridge, basket, steel wire hook and cask, the balance that soaks passes through linking bridge installs the cask top, the basket is located in the cask, through steel wire hook suspend in midair in soak balance below, the density testing device still includes the water pump, the water pump is installed among the curing means, the cask adopts the overflow basin, the overflow basin is located in the curing means, the upper portion of overflow basin is equipped with controlling water level's overflow mouth, and the bottom surface is equipped with the outlet, the overflow basin still has the inlet tube, water outlet of the water inlet with overflow basin intercommunication, the water inlet with the delivery port intercommunication of water pump. The utility model discloses can improve the accuracy of bituminous mixture density testing test result.