The utility model discloses a but automatic water supply's capillary rising degree test device on water suitable for miscellaneous soil particles of many particle diameters has mainly solved indoor experiment, and capillary rising degree test device on water that the geotechnical test rules adopted is unable to measure the problem of the capillary rising degree on water that mixes the particle diameter. Its including sample tube, the moisturizing chassis of locating sample tube below, the water tank that is located the sample tube next door that has the scale, the water tank support that is used for supporting the water tank, with the automatic water supply device of water tank intercommunication, the automatic water supply device includes through flexible rubber hose and the basin of water tank intercommunication and the ball -cock assembly of locating basin delivery port department. This test device is suitable for the miscellaneous soil particles of many particle diameters and carries out the experiment of capillary rising degree on water, can reduce the influence of border utility effectively, and the stability of data can be guaranteed to the automatic water supply device thatjust has the ball -cock assembly for it is more convenient that capillary rising degree test operation on water gets up, also can survey capillary rising degree tentation data on water more clearly.