Xiaomi Poco M3 Pro 5G is not waterproof. The Xiaomi Poco M3 Pro 5G is not even dustproof. To know if a phone is dustproof and waterproof or not, we need to check the IP rating of the phone.
The Xiaomi Poco M3 Pro 5G has only IP or Ingress Protection score of 53. The first number of the rating score refers to protection against dust and the second number refers to protection against water. Tobe dustproof, a phone needs to get 6 as the first number of IP rating and to be waterproof, the second number of the IP rating needs to be at least 7.
And Xiaomi Poco M3 Pro 5G got only an IP score of 53. So, we can confirm that Xiaomi Poco M3 Pro 5G is not waterproof.