The utility model provides a coffee maker with a brewing and locking device, and the coffee maker comprises a machine body, a top cover, a pivot shaft, a control circuit and a water dispenser. The coffee maker is characterized in that the top cover is connected on the machine body through the pivot shaft, the top cover rotates along the pivot shaft, the automatic brewing and locking device of the coffee maker comprises a piston cylinder body, a brewing cup seat and a brewing lock bracket, wherein, the piston cylinder body is arranged at the lower part of the top cover of the coffee maker, the circumference of the piston cylinder body is provided with at least a lock catch, the brewing cup seat is positioned on the machine body at the lower part of the top cover, the brewing lock bracket is arranged on the machine body by encircling a brewing cavity body, and the circumference of the brewing lock bracket is inwardly provided with a buckling position matched with the lock catch of a brewing cavity cover. A water dispenser knob and a wastewater tray are arranged on the machine body. The piston cylinder body is provided with a sealing ring. The brewing lock bracket is internally provided with a movable brewing cup seat. As the technical proposal is adopted, the brewing lock seat can be internally provided with the movable brewing cup seat, thereby being able to replace or assemble different brewing cup seats according to the brewing demands, such as an Espresso brewing cup seat, a coffee brewing cup seat, a tea brewing cup sat, etc., and being very convenient.