The invention discloses a power electric meter line loss detection device. The device includes a plurality of electric meters; each electric meter is connected with a line loss collector, and the line loss collectors are all connected to a line loss processor; each line loss collector includes a collection controller, a first Bluetooth chip and a first Bluetooth power circuit; the first Bluetooth chip is connected with the collection controller; the first Bluetooth power circuit is connected with the first Bluetooth chip; the line loss processor includes a single-chip microcomputer, a storage, a second Bluetooth chip and a second Bluetooth power circuit; the storage and the second Bluetooth chip are connected with the single-chip microcomputer; the second Bluetooth power circuit is connected with the second Bluetooth chip; and the first Bluetooth chip wirelessly communicates with the second Bluetooth chip. The power electric meter line loss detection device can effectively save power supply enterprise cost, the line loss collector and the line loss processor wirelessly communicate through Bluetooth, the power consumption is low, the cost is low, and the transmission efficiency is high.