Do I need to put a comma between different slogans?

No need

1. An exclamation point is generally used at the end of a single-sentence slogan, but generally not used in banners.

2. For slogans of more than two sentences, a comma should be used in the middle and an exclamation point should be used at the end.

For specific situations, generally speaking, the main ones are as follows:

Use commas when coordinating predicates, complements, and prepositional phrases as adverbials;

Use pauses for coordinating attributives and adverbials If the coordinating predicate has the same object, use a comma;

If the coordinating subject or object is combined into a long one, use a comma, if it is short, use a comma, and if it is modified by the same attributive, use a comma.

Specially, there are some collective expressions that cannot be separated by commas. Here are some: primary and secondary school students (cannot be written as "primary and secondary school students", the same below), urban and rural exchanges, provincial and municipal leaders, colleges and universities School, workers, peasants and soldiers, investigation and research, police officers, three or four