The invention discloses a preparation method for near-stoichiometric lithium tantalite crystal, which comprises the following steps: preparing the base material according to the molar ratio proportion of Li2CO3:Ta2O5=48-50:52-50; then adding an alkali metal except Li2O as the flux; after grinding and mixing, heating to fully decompose and release CO2; calcining the mixture to get lithium tantalite polycrystalline charge; then pressing the polycrystalline charge, putting in a crucible, heating to the fusion state, keeping the temperature and then praparing the near-stoichiometric lithium tantalite crystal using the czochralski preparation method. The preparation method for near-stoichiometric lithium tantalite crystal has the advantages that: the process of preparing the near-stoichiometric lithium tantalite crystal is made simpler; the near-stoichiometric lithium tantalite crystal with bigger size and good uniformity is made easier to prepare; industrial mass production can be realized and the cost can be reduced.