A passively Q-switched pulse fiber laser based on graphene saturable absorber is reported. Graphene, polyvinyl alcohol (PVA) with polymethyl methacrylate (PMMA) are mixed as solute and dispersed in the 2-dichlorobenzene (DCB) solvent. The graphene film is on the end face of single mode fiber by using optically driven deposition and introduced in a ring cavity fiber laser as an optically saturable absorber. The stable Q-switched operation is initiated with erbium doped fiber amplifier (EDFA) power of 4 mW. When the central wavelength is 1564 nm, the stable pulse sequence with repetition rate, pulse duration, single pulse energy and pulse peak power continuously switchable with the change of the EDFA power is generated by the passively Q-switched pulse fiber laser. The maximum single pulse energy is 82.4 nJ and the maximum pulse peak power is 25.1 mW at the pulse repetition rate of 28 kHz. Meanwhile, the minimum pulse duration of 3 μs is obtained. This fiber laser also has the ability of long time stable operation.