El Paso, Texas police used a suspect as a human punching bag, beating the living daylights out of him over the weekend ... and it was all caught on video.

Check it out ... several officers are seen taking the suspect into custody with one cop kneeing him in the face and then repeatedly punching him in the back while he's kneeling on the ground.

The clip jumps to the same officer hunching over the suspect whose still down on the ground ... the cop slams his fist into the back of the suspect before pulling out a taser and zapping him.

All the while witnesses react totally appalled as another officer socks a bystander who tries to intervene.

The El Paso Police Department confirmed to TMZ the shocking footage pertains to an arrest made on Saturday after they received a report about an indi

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