The invention aims to provide a horizontal shaft pitch-control tide energy water turbine. The water turbine comprises a front hatch cover, a rear hatch cover, a generator system, a pitch control system and a yaw assembly, wherein the generator system comprises a generator rotor, a coil and a box, the coil is fixed on the box, and the generator rotor is positioned in the coil; the pitch control system comprises a paddle, a worm wheel, a worm, a paddle-changing motor, and a turnplate; the paddle-changing motor is used for driving the worm, the worm is arranged on the turnplate and meshed with the worm wheel, and the worm wheel is fixedly connected with the paddle; the snaking assembly comprises a shuttle upright, a revolute joint and a rack, the shuttle upright is connected with the revolute joint, the revolute joint is connected with the rack, and the shuttle upright rotates on the rack through the revolute joint; and the pitch control system is connected with the generator rotor through a flange, the front hatch cover is connected with the turnplate, the rear hatch cover is connected with the generator system, and the shuttle upright is connected with the box. The water turbine provided by the invention has the advantages of simple system and high reliability, low cost, convenience in maintenance, and has a slower flow rate self-starting performance.