Shaving the head of a Buddhist is a Buddhist commandment that has existed since the time of the Buddha. Of course, not all Buddhists need to shave their heads, and Buddhists who practice at home do not need to shave their heads. 

The main reasons why Buddhists shave their heads are as follows: 

1. Break free from worries 

In Buddhism, hair is called "afflictive silk". Shaving the head is to remove afflictions. The number of hair strands is so many that it cannot be counted clearly, representing the multitude of afflictions of sentient beings. 

2. Free from cares

For sentient beings, they care about various things, among which their greatest concern is family affection. Shaving one's head means no longer caring about everything, only focusing on one's own cultivation.

3. Remove arrogance 

There is an old saying in China, people need face, trees need skin. Shaving one's head can be embarrassing for sentient beings, and this is due to arrogance. Shaving one's head is to eliminate arrogance.

4. Equality and uniformity

By shaving their heads, monks and nuns eliminate a distinctive sign of personality and individuality. This promotes equality within the monastic community, indicating that all are equal on the path to enlightenment.

5.Abandon desires
 
Buddhism believes that the suffering of sentient beings comes from their greed for the world, and Only by giving up these desires can they become happy and free. Shaving one's head represents abandoning all desires. 

The above are the main reasons why Buddhists shave their heads.