The utility model relates to the technical field of toys. The utility model relates to a toy, in particular to a child assembled combined toy matched with sand and water playing. Wherein the assembling parent body consists of a hexagonal water tank assembling parent body, a 120-degree rail assembling parent body, a linear rail assembling parent body and a Y-shaped three-way rail assembling parentbody; the core of the technical content of the utility model lies in that after the functional piece, the splicing main body and the connecting track are freely combined, a large-scale site splicing toy with multiple functions and multiple playing methods is formed. The hexagonal structure provides multiple directions for assembly, and variability of playing methods, water flow directions and shapes is achieved. Due to the design that the hexagonal small water tank is connected with the water pipe, the problem of insufficient water source caused by excessive bifurcations of the assembled toy is solved. Teachers guide children to participate in outdoor sand cement games by organizing theme activities, and track building games and mud building games are performed.