The present disclosure provides an electrical connector and a connector assembly. The electrical connector comprises a first sleeve, a first cover, and a sealing member. The first sleeve comprises a first mating opening and a first connecting end surface. The first connecting end surface is disposed at the periphery of the first mating opening. The first cover is disposed in the first sleeve. The first cover comprises a first mating surface exposed from the first mating opening. The sealing member is disposed on a side surface of the first cover and surrounds the first cover. The sealing member is disposed between the first sleeve and the first cover. The sealing member comprises a sealing sheet extending from the first mating surface in a direction close to the first connecting end surface of the first sleeve.