An ultrasonic liquid concentration detecting device, comprising a vibrating structure, a bubble removing structure, and an ultrasonic detecting main body; wherein the vibrating structure is disposed at a bottom of the ultrasonic detecting main body and is configured to buffer a shock received by the ultrasonic detecting main body; the bubble removing structure is disposed on the ultrasonic detecting main body and is configured to accelerate a flow rate of a liquid; and the ultrasonic detecting main body is configured to detect a concentration of the liquid, and the ultrasonic detecting main body comprises a probe having an ultrasonic emitting/receiving surface and a reflective surface, and the bubble removing structure is configured to eject liquid to the ultrasonic emitting/receiving surface and the reflective surface; characterized in thai the device comprises a probe mounting base; the bubble removing structure is configured to accelerate a flow rate of a liquid; wherein the vibrating structure comprises an upper connecting surface joined with a bottom surface of the probe mounting base, a lower connecting surface integrated with the ultrasonic liquid concentration detecting device, and three elastic sheets connected end to end; wherein the three elastic sheets are arranged in a stack form, and ends of the three elastic sheets are connected together through locking screws making the three elastic sheets form a firm whole; and each of the three elastic sheets is provided with an elastic region, and the elastic region is provided with a clearance hole and an elastic curvature which are configured for adjusting an elastic coefficient of the elastic sheet. wherein the vibrating structure is disposed at a bottom of the ultrasonic detecting main body and is configured to buffer a shock received by the ultrasonic detecting main body; the bubble removing structure is disposed on the ultrasonic detecting main body and is configured to accelerate a flow rate of a liquid; and the ultrasonic detecting main body is configured to detect a concentration of the liquid, and the ultrasonic detecting main body comprises a probe having an ultrasonic emitting/receiving surface and a reflective surface, and the bubble removing structure is configured to eject liquid to the ultrasonic emitting/receiving surface and the reflective surface; characterized in thai the device comprises a probe mounting base; the bubble removing structure is configured to accelerate a flow rate of a liquid; wherein the vibrating structure comprises an upper connecting surface joined with a bottom surface of the probe mounting base, a lower connecting surface integrated with the ultrasonic liquid concentration detecting device, and three elastic sheets connected end to end; wherein the three elastic sheets are arranged in a stack form, and ends of the three elastic sheets are connected together through locking screws making the three elastic sheets form a firm whole; and each of the three elastic sheets is provided with an elastic region, and the elastic region is provided with a clearance hole and an elastic curvature which are configured for adjusting an elastic coefficient of the elastic sheet.