Power supply connection structure and smoke alarm

The utility model relates to a power supply connection structure and a smoke alarm. The power supply connection structure comprises a base and a connection end cover which can be fixed with the base. The base is fixedly provided with an elastic piece, the elastic piece is provided with an insertion opening and is electrically connected with a power cable, and the connecting end cover is fixedly provided with an insertion piece corresponding to the elastic piece. A strip-shaped sliding groove is formed in one of the base and the connecting end cover, and a sliding block corresponding to the sliding groove is fixedly arranged on the other one of the base and the connecting end cover. When the sliding block is inserted to abut against the bottom wall of the sliding groove, the inserting piece is right opposite to the inserting opening. When the sliding blocks slide along the sliding grooves, the inserting pieces can be inserted into the corresponding inserting openings and are electrically connected with the ela