The utility model reveals an outdoor five-prevention lockset rainproof cover formed by the two hinged surface covers. The surfaces covers are buckled to from a hollow cavity therein accommodating a five-prevention lockset. A connection end face of the buckled surface covers comprises locking holes for placing the locking columns of the five-prevention lockset. A lock catch seat is disposed on the outer side of a surface cover. A lock catch in cooperation with the lock catch seat and fixed by a lock belt is disposed on the outer side of the other surface cover. The rainproof cover is easy to use, reasonable in structural design, capable of bearing certain impact and damage of external force, produced by high-intensity plastic, light and durable, good in insulation sealing performance, provided with good rain and snow prevention and frozen prevention functions, and capable of effectively prolonging the service life of the lockset and decreasing fault probability.