What is the difference between "walk in the street" and "walk on the street"? I google them up, and both phrases are used by many people. It's really confusing. Thanks for any answer or feedback.

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I think 'in' is more 'UK English' and 'on' is more used in the US. However 'on the street' can sometimes have a particular meaning: 
"The word on the street is that there is going to be an economic recession soon." 
(= We don't know for sure but that is the rumour; that is what 'people' are saying...)

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Walk on the street and walk in the street. Are two of the phrases  that are interchangeable in English. Meaning they basically mean the samething. It's just whichever sounds better to the user.