Here are some very popular children's educational toys:

1. LEGO blocks: LEGO blocks are a classic educational toy that can stimulate children's creativity and imagination. They can be formed into various shapes and models, such as buildings, vehicles, animals and so on.

2. Intelligence Rubik's Cube: Intelligence Rubik's Cube is a popular educational toy that requires children to restore the cube to its original state by rotating it. This toy can improve your child's spatial cognition and hand-eye coordination.

3. Jigsaw puzzles: Jigsaw puzzles are a classic educational toy that can exercise a child's observation, patience and problem-solving skills. Puzzles can be flat or three-dimensional and are suitable for children of different ages.

4. Math games: Math games can help children learn math concepts and skills. For example, math board games can develop your child's logical thinking and reasoning skills.

5. Science experiment kits: Science experiment kits can stimulate your child's interest in science and spirit of exploration. By conducting simple experiments, children can learn physics, chemistry and other scientific knowledge.

6. Electronic educational toys: Electronic educational toys are educational toys that combine education and entertainment. They usually have interactive and multimedia features that can help children learn about letters, numbers, music and more.

7. Maze toys: Maze toys can exercise children's spatial cognition and hand-eye coordination. Children need to move small balls or other objects to solve the obstacles in the maze.

8. Pinyin Alphabet Cards: Pinyin Alphabet cards can help children learn to pronounce and write Chinese characters. These cards usually come with audio and pictures to help children understand and memorize them better.

The above are some of the very popular educational toys for children. Every child has different preferences and developmental needs, so it's very important to choose the right educational toys for your child.