Club captain Bushell, 33, curled in a quickly taken free-kick from the edge of the box on 38 minutes that caught Woking keeper Shwan Jalal off guard.
Jalal was still trying to line up his wall after Neil Smith fouled Lewis Killeen when Bushell struck.
The stunned keeper later harangued referee Rob Shoebridge as the pair went down the tunnel at half-time for allowing the free-kick to be taken.
But the goal is a real boost for Bushell who broke his leg in a game at Barnet 12 months ago and has only recently forced his way back into the Halifax team following a loan spell at Altrincham to prove his fitness.
The game was a tight affair with few chances for either side on an awful pitch that cut up badly as the match progressed.
Killeen nearly sealed victory for the Shaymen with a drive that Jalal pushed on to the bar on 73 minutes.
At the other end Woking substitute Lloyd Blackman blasted a rising drive off the bar minutes later.
The visitors made a desperate effort to earn a point in the closing stages and nearly paid for it when Jalal went up for a corner in stoppage time.
Halifax won possession with Jalal still in the Halifax penalty area but instead of going for goal Bushell played the ball into the corner for Tyrone Thompson to play time out.