The invention relates to an SHS preparation method for a segment type diamond tool bit, and belongs to the technical field of diamond tools. The preparation method is characterized in that a binding agent and diamond are evenly mixed to obtain a mixture; and the mixture is subject to cold pressing to obtain a cold pressing blank, the cold pressing blank is subject to hot pressed sintering to prepare the diamond tool bit, and hot pressed sintering is carried out according to segments, wherein the cold pressing blank is firstly heated to 780 DEG C to 850 DEG C, keeps 30 min to 60 min under the pressure condition ranging from 250 kgf/cm<2> to 300 kgf/cm<2>, is then cooled to 600 DEG C to 720 DEG C and keeps 1.2 h to 3.0 h under the pressure condition ranging from 200 kgf/cm<2> to 250 kgf/cm<2>. The binding agent comprises aluminum nickel alloy powder and hard phase particles used for assisting milling. According to the preparation method, a low temperature ball-milling Al-Ni alloy component sintering system is adopted, and a sectional type sintering process is led in; the holding force of a blank body on the diamond and the hard phase particles is improved; and in addition, the abrasive resistance of the blank body is matched with an exit lip of the diamond and the hard phase particles, and the cutting performance of the segment type diamond tool bit is better improved.