A robotic arm has an arm assembly, a connection device, and a clamping device. The arm assembly has a bottom base and a connecting base. The connection device is connected with the connecting base and has a housing and a locking member. The housing is connected securely with the connecting base and has a mounting hole defined in a side of the housing. The locking member is mounted moveably in the housing and extends into the mounting hole. The clamping device is combined with the connection device and has a head rod and a clamping head. The head rod has a first end and a second end. The first end extends into the mounting hole and is securely connected with the locking member. The second end is opposite the first end and is provided with a holding recess. The clamping head is mounted securely on the second end of the head rod.