The invention discloses a horizontal type shell-and-tube heat exchange condenser. The horizontal type shell-and-tube heat exchange condenser is composed of a shell (1), a tube box (2), a tube bundle (8), a floating head (10), an outer cover (11), a tube layer material outflow opening (3), a tube layer material flow-in opening (5), a shell layer material flow-in opening (4), a shell layer material outflow opening (9), a baffle plate A (6) and a baffle plate (15). The baffle plate A (6) and the baffle plate (15) are arranged in a spaced manner, and an upper arch gap (12) and a lower arch gap (13) are formed in the baffle plate (15). The chord height of the upper arch gap (12) is 10% to 40% of the diameter of the shell (1), and the distance between the baffle plate A (6) and the baffle plate (15) ranges from 80 mm to 750 mm. According to the condenser, the heat exchange strength is improved, the heat exchange efficiency of the condenser is improved, the needed heat exchange area is reduced, metal consumption of a heat exchanger is reduced, and investment and energy consumption are reduced.