Pressure balance system of automatic ELISA (Enzyme-Linked Immunosorbent Assay) plate washer and automatic ELISA plate washer

The invention discloses a pressure balance system of an automatic ELISA (Enzyme-Linked Immunosorbent Assay) plate washer and the ELISA plate washer. The ELISA plate washer comprises a cleaning head, a vacuum pump and a plurality of lotion bottles for providing lotion for a lotion needle of the cleaning head; and the pressure balance system comprises a first multi-path joint, a main exhaust pipe and at least one auxiliary exhaust pipe, wherein the first multi-path joint is connected with the vacuum pump and the lotion bottles and used for balancing the pressure suffered by the lotion bottles, the main exhaust pipe and the at least one auxiliary exhaust pipe are respectively connected with the first multi-path joint and used for discharging air outside, and a switch is arranged on the auxiliary exhaust pipe and connected with a control circuit for controlling the on and off of the switch. According to the invention, the pressure balance system is arranged in the ELISA plate washer, so that the pressure of a pipeline in the ELISA plate washer can be adjusted automatically, the pressure generated by the vacuum pump can be matched with the flow of the lotion needle on the cleaning head automatically, the flowing rate of the lotion distributed for the lotion needle by the cleaning head can be kept consistent under any state, so that when a large plate washer is used for few pore plates, the damage of an instrument as part of washing channel is closed and excessive overflowing liquid overflows a tray and enters the machine can be prevented.