The invention discloses a fully-automatic blood mixing instrument provided with blood collection tubes. The fully-automatic blood mixing instrument comprises a device seat, bases fixed on the two sides of the device seat as well as a first blood mixing tray and a second blood mixing tray which are movably arranged above the two bases, wherein the first blood mixing tray and the second blood mixingtray are symmetrically mounted on two sides of the device seat; the device seat comprises an outer casing, a touch panel mounted on the front side of the outer casing as well as a controller and a centrifugal mechanism which are mounted in the outer casing; the touch panel and the centrifugal mechanism are in electronic control connection with the controller respectively; the first blood mixing tray comprises a first upper trough plate and a first lower support plate; the second blood mixing tray comprises a second upper trough plate and a second lower support plate. The fully-automatic bloodmixing instrument provided with the blood collection tubes is simple in structure, convenient to operate and good in blood mixing stability; with the adoption of a detachable structure, overall transfer of the first blood mixing tray and the second blood mixing tray and assembly and disassembly of the blood collection tubes are facilitated, and the blood mixing efficiency is improved.