Singer d4vd had a rough first day while performing for the opening of Coachella … ’cause the poor dude faceplanted hard on stage during a stunt gone wrong!

D4vd took to the Gobi stage at Coachella Friday around 6 PM … and it all seemed to be going well … that is, until he tried to do a backflip.

Check out the video … the poor dude damn-near knocked himself out!

The stunt-gone-wrong happened in the middle of his song “Leave Her” … and d4vd had no idea where he was for a few moments at best, gave himself a concussion at worst. Either way … the dude was clearly hurtin’!

It’s all good, though … he got checked out on stage and seemed to laugh off the embarrassing moment — before nailing a couple of backflips to redeem himself!