The invention discloses a high temperature resisting thixotropic anti-fluid-channeling well cementing cement slurry system. The high temperature resisting thixotropic anti-fluid-channeling well cementing cement slurry is prepared from the following components in parts by weight:100 parts of cement, 1 to 4 parts of a thixotropic agent, 8 to 13 parts of micro silicon, 2 to 4 parts of a dispersing agent, 2 to 3 parts of a retarder, 2 to 3 parts of a fluid loss agent, 0.1 to 0.25 part of sodium hydroxide, 0.5 to 1 part of a defoaming agent, 30 to 35 parts of silica sand of180 meshes, 15 to 20 parts of silica sand of 80 meshes and 53 to 60 parts of water. The cement system disclosed by the invention has the following characteristics: firstly, the thixotropy performance is good under high temperature condition and an internal structure is easy to destroy after a machine is shut down and started; secondly, the cement system has good strength characteristics which meets strength requirements of cementing construction; thirdly, the cement slurry has good thickening performance, fluidity energy, sedimentation stability, right angle thickening characteristics and less water loss so as to meetthe requirements of site construction; fourthly, the operation time and cost are saved and technical support is provided for cementing formation which is easy for leak and fluid channeling.