Trott finished on 211 not out ??? adding 35 to his overnight score ??? as the Lions declared on 624-8, a first innings lead of 120.
They had just over two sessions left on the final day to try and force a result but on a stubbornly docile surface at Boland Park in Paarl, they could only make minor inroads into the South African batting line-up, reducing them to 92-2 before a draw was agreed at tea.
Trott???s innings was spread across three days, lasting almost 11 hours, with 17 fours from 403 balls.
His efforts helped the Lions out of a spot of bother too, from 67-3 at one stage on the second day, he and a succession of partners piled on the runs.
James Vince, Jonny Bairstow and Adil Rashid all hit quick-fire fifties in support of Trott and Liam Plunkett (55) and Jack Brooks (53no) added to that list on day four.
Brooks??? fifty was only his second in first-class cricket and came off just 38 balls, with five fours and two sixes.
When the declaration came, early wickets were needed but the only two taken came with the score at 64 and 77.
Boyd Rankin trapped first-innings centurion, Gihahn Gloete, lbw for 29 before Rashid picked up his only wicket of the match, Stiaan van Zyl for 38.
The hosts ticked along to 92-2 by the tea interval but captains Trott and Rory Kleinveldt agreed to call it a draw.
The second and final unofficial Test between the two gets underway in Bloemfontein on Sunday.