The invention relates to a liquid detergent extrusion device. The liquid detergent extrusion device comprises a left clamping plate and a right clamping plate, wherein the lower parts of the inner side surfaces of the left clamping plate and the right clamping plate are connected through a hinging way; the lower end of the left clamping plate is connected with a clamping buckle through the hinging way; two guide sleeves are respectively arranged at the upper parts of the front end surface and the rear end surface of the right clamping plate; two arc-shaped guide plates are respectively arranged at the upper parts of the front end surface and the rear end surface of the left clamping plate through the hinging way; the two arc-shaped guide plates both penetrate through the corresponding guide sleeves and are jointly and fixedly connected with a pushing post which is positioned at the right side of the right clamping plate; an air cylinder is arranged at the upper part of the right end surface of the right clamping plate through the hinging way; a pushing rod of the air cylinder is connected to the middle part of the pushing post through the hinging way. According to the liquid detergent extrusion device disclosed by the invention, the pushing post is pushed through the pushing rod of the air cylinder, and the arc-shaped guide plates are pulled by utilizing the pushing post, so that the left clamping plate and the right clamping plate are pulled together, the purpose of extruding the liquid detergent between the left clamping plate and the right clamping plate is achieved, and automatic control on the addition of the liquid detergent is realized.