1, the political system of the family is different. Monarchy is determined by the national nature of slavery and feudalism, while constitutionalism is a new regime after the emergence of capitalism, which is determined by the national nature of capitalist private ownership of means of production.

2. Both came into being in different times. The former came into being when human beings entered the slavery society, and the latter came into being after the capitalist society.

3. The king or emperor (leader) in absolute monarchy is in an authoritative position, sacred and inviolable, and is considered as the divine right of the monarch; The king of constitutional monarchy is in the position of "unification without cure" and has no real power.

4. The scope of the two is different. Monarchy includes constitutional monarchy and absolute monarchy.

They belong to different countries. Monarchical autocracy is determined by the national nature of slavery and feudalism, while constitutionalism is a new regime after the emergence of capitalism, which is determined by the national nature of capitalist private ownership of means of production.