The utility model discloses an anti -floating pile and underwater concrete tongue -and -groove coupling mechanism, including steel pipe, annular steel sheet, annular thick liquid net piece and the haulage rope of sealing, steel pipe and the vertical main muscle fixed connection of steel reinforcement cage are seted up on the steel pipe and are worn to draw the hole, and at least fixed connection has two on the steel pipe the annular steel sheet has an interval between two blocks of annular steel sheets, has one side fixedly connected with of two blocks of annular steel sheets at least thick liquid net piece is sealed to the annular, and haulage rope one end is connected with the annular thick liquid net piece that seals, and the haulage rope other end stretches out in the steel pipe through wearing to draw the hole. The utility model discloses utilize steel pipe, annular steel sheet, annular to seal thick liquid net piece and drilled pile pore wall and form a solid jointly and seal slurry system, stop the anti -floating pile concrete to get into the annular space between steel pipe and the drilled pile pore wall, need not pre -buried filler before building the anti -floating pile concrete, when realizing that anti -floating pile and underwater concrete effectively are connected, the simplification process of constructing, the cost of using manpower sparingly.