The present invention discloses an ultrasound focusing transducer, including a shell, and a piezoelectric ceramic wafer, a fixed sealing part and a support accommodated in the shell, the piezoelectric ceramic wafer is of a spherical segment shape and has a spherical-segment shaped through hole which has a first side opening and a second side opening, the hole size of the first side opening is smaller than that of the second side opening, one end of the piezoelectric ceramic wafer forming the second side opening abuts against one end of the shell, and one end of the piezoelectric ceramic wafer forming the first side opening faces the other end of the shell； the fixed sealing part is annular, installed on the inner surface of the shell, abutting against the piezoelectric ceramic wafer, and is connected to the support in a sealed manner； the support includes a clamping part, and the clamping part is adapted to press and clamp the periphery of the first side opening of the piezoelectric ceramic wafer； the fixed sealing part, the support and the piezoelectric ceramic wafer cooperatively form a sealed air cavity. The present invention also provides an ultrasound focusing treatment head comprises a B-mode ultrasound probe and the above-mentioned ultrasound focusing transducer. The ultrasound focusing transducer has a good sealing performance.
