The young goalkeeper was thrust into the first team at the end of the 2016-17 campaign following Scott Loach's loan move to York City.
Searson-Smithard, a Notts fan, joined the club's academy at the age of 14 and has progressed through to appear on the bench on a number of occasions.
He has enjoyed loan spells with Dunkirk and Radcliffe, which he says have prepared him for the rough and tumble of senior mens football with Notts.
Home kit: Available
Away kit: Available
Third kit: Available
Boots & socks: Available