We can imagine how bad it is if we lost some valuable photos or videos. This sometimes happens. For example, accidently deleted by ourself, or wrongly formatted our sd card. The good thing is that I found it's possible to recover back all files on my android phone sd card and easy,too.I used this
android recovery tool to help me.
First, install and run the program on your computer, and you’ll get the interface as follows.

Step1. Connect Android to computer
Directly connect your Android phone to the computer with a USB cable, without needing to take the SD card out of the phone. When it appears as a hard disk on your computer, the program will detect it as follows.
Step2. Scan lost data
After connecting the Android phone to the program, click on the “Start” to find out all lost data from the SD card on your Android.
Step3. Preview and check
All recoverable data are categorized as different file types, such as archive, audio, graphic, video, etc. You can preview the photos in original quality, and check the other files one by one.
Step4. Recover
Check the single file or the whole file type that you want back, and click on the “Recover” to save on your computer.
Hope this can be useful for all android users.