He was also accused of sleeping on duty and absenteeism.
Mr Akinniyi, who is the oldest member of the house, was recently removed as Chief Whip.
The house reached the decision after receiving a report of its ad-hoc disciplinary committee headed by Fajemilehin Ayodele.
The report stated that Mr Akinniyi was involved in “violent conduct against other members, absenteeism, sleeping on duty, gross abuse of office, anti party activities, and engaging in activities capable of bringing down the dignity of the House.
It is believed in some quarters that Mr Akinniyi is suffering political persecution with his suspension coinciding with the political tensions in Ekiti State in the battle of who becomes governor on July 14.
The lawmaker is said to be an associate of a former PDP governorship aspirant, Dayo Adeyeye, who has now decamped to the All Progressives Congress.
Another lawmaker who was known to have sympathy for Mr Adeyeye, Segun Adewumi, was also recently removed as the Deputy Speaker.
Wednesday’s suspension came on the heels of reports that Messrs Adewumi and Akinniyi had planned to defect to the APC.
In his report submitted to the assembly, Mr Fajemilehin said that all efforts geared towards getting the lawmaker to defend himself proved abortive due to his refusal to honour the invitation of the committee.
PT