The invention discloses an electric pressure cooker and a cover in-place closure safety device thereof. The electric pressure cooker comprises a cover unit, an inner pot unit and a pot unit. The inner pot unit is disposed between the cover unit and the pot unit. The cover unit comprises a face cover, an inner cover and a first magnet. The pot unit comprises a reed switch connected to a master control circuit of the electric pressure cooker. The inner pot unit comprises a second magnet; the second magnet can move relative to the reed switch. The problem of the prior art that since the reed switch far away from the first magnet is unable to sensitively detect magnetism of the first magnet, the electric pressure cooker fully covered is still unable to run is solved. Additionally, the cover unit is detachably mounted on the pot unit, thus cleaning the cover unit is facilitated. The invention further provides the electric pressure cooker which is simple in structure and which comprises the cover in-place closure safety device.