The utility model discloses a tunnel side wall waterstop positioning fixture, its characterized in that: the positioning fixture include L section mould board (1), L section mould board (1) comprisesinterconnect riser (2) and horizontal plate (3), and the cross -under has screw rod (4) on horizontal plate (3), and threaded connection is gone up in screw rod (4) has two hand twisting nut (5) thatare located both sides about horizontal plate (3) respectively, is provided with horizontal sleeve (6) on the top of screw rod (4), horizontal sleeve (6) internalization has cup jointed anchor clampspole (7), on horizontal sleeve (6) threaded connection have with bolt (8) are twisted to two hands that anchor clamps pole (7) match, are provided with baffle (9) in the one end of anchor clamps pole(7), still are connected with screw shell (10) through the connecting rod at the middle part of anchor clamps pole (7), have the tight screw rod (11) of clamp at screw shell (10) female connection, press from both sides tight screw rod (11) and are provided with end (12) towards the one end of baffle (9).