The invention discloses a shelf temperature control device and system. The shelf temperature control device comprises a fixed support and a heat exchanger. An electronic device is detachably arranged on the fixed support. The heat exchanger is detachably arranged on the fixed support and is arranged in the row of the electronic device. The heat exchanger has a heat exchange core having a first side surface, a second side surface opposite to the first side surface, a plurality of inner circulation channels and a plurality of outer circulation channels, and the inner circulation channels and the outer circulation channels are arranged in a staggered isolation structure. An inner circulation air flow flows among the inner circulation channels and the electronic device. An outer circulation air flow passes through the outer circulation channels via the first side surface of the heat exchanger core and flows to the second side surface of the heat exchanger core.