The utility model discloses a can shift oil bath device of test -tube rack safely fast, including oil bath pond, mistake filter stand, U type frame and test -tube rack, fix on one side pool wall in oil bath pond and set up a plate washer, just be provided with a track groove on the plate washer, the one end of crossing the filter stand is fixed in oil bath chi chibibi yanchu, another abutting end fixed connection is on the plate washer, U type frame place in cross on the filter stand, the test -tube rack set up in in the U shaped frame of U type frame, the one end of U type frame is provided with the slide bar, the fixed welding handle of the other end, the slide bar inlay in in the track groove. The utility model discloses a slide bar that sets up on track groove and the U type frame forms sliding fit, make the handle can be fast safe with the test -tube rack the oil bath pond and shift between the filter stand. The utility model discloses simple structure, convenient operation has reduced operating personnel's danger, is favorable to improving the accuracy of soil organic matter analysis and detection result, has increased substantially work efficiency.